The group consists of yttrium and the 15 lanthanide elements (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium). Carbon (from Latin carbo 'coal') is a chemical element with the symbol C and atomic number 6. It illustrates the lack of agreement surrounding the concept, with the possible exception of mercury, lead and bismuth.. Six elements near the end of periods (rows) 4 Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here! The Toyota Prius (/ p r i s /) (Japanese: , Hepburn: Toyota Puriusu) is a car built by Toyota which has a hybrid drivetrain, combining an internal combustion engine with an electric motor.Initially offered as a four-door sedan, it has been produced only as a five-door liftback since 2003.. c The activity of Ir-192 in special form may be determined from a measurement of the rate of decay or a measurement of the radiation level at a prescribed distance from the source. Carbon makes up only about 0.025 percent of Earth's crust. Almost two years ago, we launched PubMed Journals, an NCBI Labs project. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Element Xenon (Xe), Group 18, Atomic Number 54, p-block, Mass 131.293. The periodic table is an arrangement of the chemical elements, structured by their atomic number, electron configuration and recurring chemical properties.In the basic form, elements are presented in order of increasing atomic number, in the reading sequence. unless as byproduct of platinum group metal extraction. Element Lanthanum (La), Group 19, Atomic Number 57, d-block, Mass 138.905. unless as byproduct of platinum group metal extraction. The large number of free electrons gives metals their high values of electrical while others have been found in only a few locations worldwide. Technetium and promethium (atomic numbers 43 and 61, respectively) and all the elements with evolutionary relationships between sequences as well as help identify Enter organism common name, scientific name, or tax id. This table shows the number of heavy metal criteria met by each metal, out of the ten criteria listed in this section i.e. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air. For example, the "4s subshell" is a subshell of the fourth (N) shell, with the type (s) described in the first row.The second column is the azimuthal quantum number () of the subshell. c The activity of Ir-192 in special form may be determined from a measurement of the rate of decay or a measurement of the radiation level at a prescribed distance from the source. This group is closely related to the rare-earth elements.Although some controversy exists regarding the composition and placement of this group, it is generally agreed among those who study the matter that this group contains the four elements scandium (Sc), yttrium (Y), lutetium (Lu), and lawrencium (Lr). Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. In chemistry, a group (also known as a family[1]) is a column of elements in the periodic table of the chemical elements. Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. It is the first element in group 6.It is a steely-grey, lustrous, hard, and brittle transition metal. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. PubMed Journals helped people follow the latest biomedical literature by making it easier to find and follow journals, browse new articles, and included a Journal News Feed to track new arrivals news links, trending articles and important article updates. Then, rows and columns are created by starting new rows and inserting blank cells, so that rows and columns show elements The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms (i.e., the same core The only stable isotope of niobium has mass number 93, and fission products of mass 93 first decay to long-lived zirconium-93 (half-life 1.53 Ma). It is part of the refractory metals group, which are widely used as minor components in alloys. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. For example, potassium (K) has one valence electron. Jump to main content . Previously known as tantalium, it is named after Tantalus, a villain from Greek mythology. In lanthanum, as a further illustration, the electrons involved are in the 6s; 5d; and 4f orbitals, respectively. Previously known as tantalium, it is named after Tantalus, a villain from Greek mythology. The https:// ensures that you are connecting to the This table shows the number of heavy metal criteria met by each metal, out of the ten criteria listed in this section i.e. The Basic Local Alignment Search Tool (BLAST) finds regions of local Element Platinum (Pt), Group 10, Atomic Number 78, d-block, Mass 195.084. b The values of A 1 and A 2 in Curies (Ci) are approximate and for information only; the regulatory standard units are Terabecquerels (TBq) (see Appendix A to Part 71Determination of A 1 and A 2, Section I). Rare earth elements are a group of seventeen chemical elements that occur together in the periodic table (see image). Therefore, it is located in group 1. Manhattan District The Trinity test of the Manhattan Project on 16 July 1945, was the first detonation of a nuclear weapon. This group is closely related to the rare-earth elements.Although some controversy exists regarding the composition and placement of this group, it is generally agreed among those who study the matter that this group contains the four elements scandium (Sc), yttrium (Y), lutetium (Lu), and lawrencium (Lr). The 83rd element, bismuth, was traditionally regarded as having the heaviest stable isotope, bismuth-209, but in 2003 researchers in Orsay, France, measured the half-life of 209 Bi to be 1.9 10 19 years. The Basic Local Alignment Search Tool (BLAST) finds regions of local similarity between sequences. PubMed Journals was a successful Continue Chromium metal is valued for its high corrosion resistance and hardness.A major development in steel production was the discovery that steel could be made highly resistant to corrosion and discoloration by adding Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. A pnictogen (/ p n k t d n / or / n k t d n /; from Ancient Greek: "to choke" and -gen, "generator") is any of the chemical elements in group 15 of the periodic table. The number proceeds in a linearly increasing fashion for the most part, once on the left of the table, and once on the right (see List of oxidation states of the elements), with some irregularities in the transition metals. BLAST can be used to infer functional and evolutionary relationships between sequences as well as help identify members of The program compares nucleotide or protein sequences to sequence databases and calculates the statistical significance of matches. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. General inorganic chemistry texts usually put scandium (Sc), yttrium (Y), lanthanum (La), and actinium (Ac) in group 3, so that CeLu and ThLr become the f-block between groups 3 and 4. The 83rd element, bismuth, was traditionally regarded as having the heaviest stable isotope, bismuth-209, but in 2003 researchers in Orsay, France, measured the half-life of 209 Bi to be 1.9 10 19 years. Of the first 82 elements in the periodic table, 80 have isotopes considered to be stable. The large number of free electrons gives metals their high values of electrical while others have been found in only a few locations worldwide. Bethesda, MD 20894, Web Policies It illustrates the lack of agreement surrounding the concept, with the possible exception of mercury, lead and bismuth.. Six elements near the end of periods (rows) 4 Group 7, numbered by IUPAC nomenclature, is a group of elements in the periodic table.They are manganese (Mn), technetium (Tc), rhenium (Re), and bohrium (Bh). Promethium is a chemical element with the symbol Pm and atomic number 61. FOIA Rare earth elements are a group of seventeen chemical elements that occur together in the periodic table (see image). Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. Palladium is a chemical element with the symbol Pd and atomic number 46. Element Lanthanum (La), Group 19, Atomic Number 57, d-block, Mass 138.905. It is a rare and lustrous silvery-white metal discovered in 1803 by the English chemist William Hyde Wollaston.He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas.Palladium, platinum, rhodium, ruthenium, iridium and Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. The Toyota Prius (/ p r i s /) (Japanese: , Hepburn: Toyota Puriusu) is a car built by Toyota which has a hybrid drivetrain, combining an internal combustion engine with an electric motor.Initially offered as a four-door sedan, it has been produced only as a five-door liftback since 2003.. n/a Do not have a group number b The composition of group 3 is not agreed among sources: see Periodic table#Group 3 and Group 3 element#Dispute on composition. Element Beryllium (Be), Group 2, Atomic Number 4, s-block, Mass 9.012. For example, group 16 is also described as the "oxygen group" and as the "chalcogens". Group 15 is also known as the nitrogen group or nitrogen family.It consists of the elements nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb) and bismuth (Bi). Element Xenon (Xe), Group 18, Atomic Number 54, p-block, Mass 131.293. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting All of its isotopes are radioactive; it is extremely rare, with only about 500600 grams naturally occurring in Earth's crust at any given time.Promethium is one of only two radioactive elements that are followed in the periodic table by elements with stable forms, the other being technetium. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air. Group A vertical column in the periodic table. Lanthanum is a chemical element with the symbol La and atomic number 57. Tantalum is a rare, soft when pure, blue-gray, lustrous transition metal that is highly corrosion-resistant. Carbon (from Latin carbo 'coal') is a chemical element with the symbol C and atomic number 6. However, the two systems use the letters differently. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Palladium is a chemical element with the symbol Pd and atomic number 46. sharing sensitive information, make sure youre on a federal This group is closely related to the rare-earth elements.Although some controversy exists regarding the composition and placement of this group, it is generally agreed among those who study the matter that this group contains the four elements scandium (Sc), yttrium (Y), lutetium (Lu), and lawrencium (Lr). The precise definition involves quantum mechanics, but it is a number that characterizes the subshell. Both systems agree on the numbers. In lanthanum, as a further illustration, the electrons involved are in the 6s; 5d; and 4f orbitals, respectively. In this case the principal quantum numbers are 6, 5, and 4. b The values of A 1 and A 2 in Curies (Ci) are approximate and for information only; the regulatory standard units are Terabecquerels (TBq) (see Appendix A to Part 71Determination of A 1 and A 2, Section I). Promethium is a chemical element with the symbol Pm and atomic number 61. The only stable isotope of niobium has mass number 93, and fission products of mass 93 first decay to long-lived zirconium-93 (half-life 1.53 Ma). In lanthanum, as a further illustration, the electrons involved are in the 6s; 5d; and 4f orbitals, respectively. The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms (i.e., the same core Element Krypton (Kr), Group 18, Atomic Number 36, p-block, Mass 83.798. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype.Lanthanum is traditionally counted among the The old IUPAC system was frequently used in Europe, while the CAS is most common in America. Lanthanum is a chemical element with the symbol La and atomic number 57. For example, the "4s subshell" is a subshell of the fourth (N) shell, with the type (s) described in the first row.The second column is the azimuthal quantum number () of the subshell. Chromium metal is valued for its high corrosion resistance and hardness.A major development in steel production was the discovery that steel could be made highly resistant to corrosion and discoloration by adding Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Three isotopes occur naturally, 12 C and 13 C being stable, while 14 C is a Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. BLAST can be used to infer functional and Chromium is a chemical element with the symbol Cr and atomic number 24. Element Krypton (Kr), Group 18, Atomic Number 36, p-block, Mass 83.798. Element Zinc (Zn), Group 12, Atomic Number 30, d-block, Mass 65.38. It is part of the refractory metals group, which are widely used as minor components in alloys. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting The first column is the "subshell label", a lowercase-letter label for the type of subshell. Element Xenon (Xe), Group 18, Atomic Number 54, p-block, Mass 131.293. In astrophysics and nuclear physics, it usually refers to iron, cobalt, nickel, chromium, and manganese. Niobium-95 will decay to molybdenum-95 which is stable. Like other groups, the members of this family show patterns in their electron configurations, especially the outermost shells resulting in trends in chemical behavior. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements.There are 18 numbered groups in the periodic table; the f-block columns (between groups 2 and 3) are not numbered. All known elements of group 7 are transition metals. There are 18 numbered groups in the periodic table; the f-block columns (between groups 2 and 3) are not numbered. Tantalum is a rare, soft when pure, blue-gray, lustrous transition metal that is highly corrosion-resistant. Like other groups, the members of this family show patterns in their electron configurations, especially the outermost shells resulting in trends in chemical behavior. The new system simply numbers the groups increasingly from left to right on the standard periodic table. When it comes to use lanthanum best resembles a successful movie bit part player. members of gene families. The system of eighteen groups is generally accepted by the chemistry community, but some dissent exists about membership of several elements. The first column is the "subshell label", a lowercase-letter label for the type of subshell. In this case the principal quantum numbers are 6, 5, and 4. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. It is the first element in group 6.It is a steely-grey, lustrous, hard, and brittle transition metal. The IUPAC proposal was first circulated in 1985 for public comments,[2] and was later included as part of the 1990 edition of the Nomenclature of Inorganic Chemistry. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting When it comes to use lanthanum best resembles a successful movie bit part player. Element Platinum (Pt), Group 10, Atomic Number 78, d-block, Mass 195.084. Tantalum is a rare, soft when pure, blue-gray, lustrous transition metal that is highly corrosion-resistant. Carbon (from Latin carbo 'coal') is a chemical element with the symbol C and atomic number 6. Tantalum is a chemical element with the symbol Ta and atomic number 73. The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms (i.e., the same core charge), because most chemical properties are dominated by the orbital location of the outermost electron. Element Zinc (Zn), Group 12, Atomic Number 30, d-block, Mass 65.38. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air. In this case the principal quantum numbers are 6, 5, and 4. An official website of the United States government. This soft, silvery-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury.Like zinc, it demonstrates oxidation state +2 in most of its compounds, and like mercury, it has a lower melting point than the transition metals in groups 3 through 11. n/a Do not have a group number b The composition of group 3 is not agreed among sources: see Periodic table#Group 3 and Group 3 element#Dispute on composition. Of the first 82 elements in the periodic table, 80 have isotopes considered to be stable. The program compares nucleotide or protein sequences to sequence databases and calculates the statistical significance of matches. Element Beryllium (Be), Group 2, Atomic Number 4, s-block, Mass 9.012. The first column is the "subshell label", a lowercase-letter label for the type of subshell. For example, the "4s subshell" is a subshell of the fourth (N) shell, with the type (s) described in the first row.The second column is the azimuthal quantum number () of the subshell. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at 114 C (237 F), and boils to a violet gas at 184 C (363 F). It is nonmetallic and tetravalentits atom making four electrons available to form covalent chemical bonds.It belongs to group 14 of the periodic table. The Toyota Prius (/ p r i s /) (Japanese: , Hepburn: Toyota Puriusu) is a car built by Toyota which has a hybrid drivetrain, combining an internal combustion engine with an electric motor.Initially offered as a four-door sedan, it has been produced only as a five-door liftback since 2003.. Three isotopes occur naturally, 12 C and 13 C being stable, while 14 C is a Group 7, numbered by IUPAC nomenclature, is a group of elements in the periodic table.They are manganese (Mn), technetium (Tc), rhenium (Re), and bohrium (Bh). Element Lanthanum (La), Group 19, Atomic Number 57, d-block, Mass 138.905. It is part of the refractory metals group, which are widely used as minor components in alloys. Element Krypton (Kr), Group 18, Atomic Number 36, p-block, Mass 83.798. Both use numerals (Arabic or Roman) and letters A and B. It illustrates the lack of agreement surrounding the concept, with the possible exception of mercury, lead and bismuth.. Six elements near the end of periods (rows) 4 Accessibility In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements.There are 18 numbered groups in the periodic table; the f-block columns (between groups 2 and 3) are not numbered. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Lanthanum is a chemical element with the symbol La and atomic number 57. Tantalum is a chemical element with the symbol Ta and atomic number 73. Cadmium is a chemical element with the symbol Cd and atomic number 48. The group consists of yttrium and the 15 lanthanide elements (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium). Carbon makes up only about 0.025 percent of Earth's crust. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. It replaces two older incompatible naming schemes, used by the Chemical Abstract Service (CAS, more popular in the US), and by IUPAC before 1990 (more popular in Europe). It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype.Lanthanum is traditionally counted among the General inorganic chemistry texts usually put scandium (Sc), yttrium (Y), lanthanum (La), and actinium (Ac) in group 3, so that CeLu and ThLr become the f-block between groups 3 and 4. Element Boron (B), Group 13, Atomic Number 5, p-block, Mass 10.81. two based on density, three on atomic weight, two on atomic number, and three on chemical behaviour. Groups may also be identified using their topmost element, or have a specific name. This soft, silvery-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury.Like zinc, it demonstrates oxidation state +2 in most of its compounds, and like mercury, it has a lower melting point than the transition metals in groups 3 through 11. The precise definition involves quantum mechanics, but it is a number that characterizes the subshell. A pnictogen (/ p n k t d n / or / n k t d n /; from Ancient Greek: "to choke" and -gen, "generator") is any of the chemical elements in group 15 of the periodic table. This soft, silvery-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury.Like zinc, it demonstrates oxidation state +2 in most of its compounds, and like mercury, it has a lower melting point than the transition metals in groups 3 through 11. Then, rows and columns are created by starting new rows and inserting blank cells, so that rows and columns show elements Rare earth elements are a group of seventeen chemical elements that occur together in the periodic table (see image). The program compares nucleotide or protein sequences to sequence databases and calculates the statistical significance of matches. In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements.There are 18 numbered groups in the periodic table; the f-block columns (between groups 2 and 3) are not numbered. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. The precise definition involves quantum mechanics, but it is a number that characterizes the subshell. Almost two years ago, we launched PubMed Journals, an NCBI Labs project. significance of matches. All known elements of group 7 are transition metals. Almost two years ago, we launched PubMed Journals, an NCBI Labs project. unless as byproduct of platinum group metal extraction. Group A vertical column in the periodic table. General inorganic chemistry texts usually put scandium (Sc), yttrium (Y), lanthanum (La), and actinium (Ac) in group 3, so that CeLu and ThLr become the f-block between groups 3 and 4. Niobium-95 will decay to molybdenum-95 which is stable. Active 19421946 Disbanded 15 August 1947 Country United States United Kingdom Canada Branch U.S. Army Corps of Engineers Garrison/HQ Oak Ridge, Tennessee, U.S. Anniversaries 13 August 1942 Engagements Allied invasion of Italy Allied Active 19421946 Disbanded 15 August 1947 Country United States United Kingdom Canada Branch U.S. Army Corps of Engineers Garrison/HQ Oak Ridge, Tennessee, U.S. Anniversaries 13 August 1942 Engagements Allied invasion of Italy Allied Disagreements mostly involve elements number 1 and 2 (hydrogen and helium), as well as inner transition metals. Three isotopes occur naturally, 12 C and 13 C being stable, while 14 C is a It is nonmetallic and tetravalentits atom making four electrons available to form covalent chemical bonds.It belongs to group 14 of the periodic table. PubMed Journals was a successful Continue Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here! The group consists of yttrium and the 15 lanthanide elements (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium). BLAST can be used to infer functional and evolutionary relationships between sequences as well as help identify members of All of its isotopes are radioactive; it is extremely rare, with only about 500600 grams naturally occurring in Earth's crust at any given time.Promethium is one of only two radioactive elements that are followed in the periodic table by elements with stable forms, the other being technetium. Carbon makes up only about 0.025 percent of Earth's crust. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Cadmium is a chemical element with the symbol Cd and atomic number 48. protein sequences to sequence databases and calculates the statistical Chromium is a chemical element with the symbol Cr and atomic number 24. The new IUPAC scheme was developed to replace both systems as they confusingly used the same names to mean different things. b The values of A 1 and A 2 in Curies (Ci) are approximate and for information only; the regulatory standard units are Terabecquerels (TBq) (see Appendix A to Part 71Determination of A 1 and A 2, Section I). Active 19421946 Disbanded 15 August 1947 Country United States United Kingdom Canada Branch U.S. Army Corps of Engineers Garrison/HQ Oak Ridge, Tennessee, U.S. Anniversaries 13 August 1942 Engagements Allied invasion of Italy Allied The numbers indicate approximately the highest oxidation number of the elements in that group, and so indicate similar chemistry with other elements with the same numeral. Calcium (Ca) is in group 2, for it contains two valence electrons. Of the first 82 elements in the periodic table, 80 have isotopes considered to be stable. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Manhattan District The Trinity test of the Manhattan Project on 16 July 1945, was the first detonation of a nuclear weapon. Then, rows and columns are created by starting new rows and inserting blank cells, so that rows and columns show elements 8600 Rockville Pike When it comes to use lanthanum best resembles a successful movie bit part player. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Element Platinum (Pt), Group 10, Atomic Number 78, d-block, Mass 195.084. The only stable isotope of niobium has mass number 93, and fission products of mass 93 first decay to long-lived zirconium-93 (half-life 1.53 Ma). Chromium metal is valued for its high corrosion resistance and hardness.A major development in steel production was the discovery that steel could be made highly resistant to corrosion and discoloration by adding BLAST can be used to infer functional and evolutionary relationships between sequences as well as help identify members of and transmitted securely. Group 3 is the first group of transition metals in the periodic table. Element Boron (B), Group 13, Atomic Number 5, p-block, Mass 10.81. Iodine is a chemical element with the symbol I and atomic number 53. An exception is the "iron group", which usually refers to "group 8", but in chemistry may also mean iron, cobalt, and nickel, or some other set of elements with similar chemical properties. Palladium is a chemical element with the symbol Pd and atomic number 46. PubMed Journals helped people follow the latest biomedical literature by making it easier to find and follow journals, browse new articles, and included a Journal News Feed to track new arrivals news links, trending articles and important article updates. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at 114 C (237 F), and boils to a violet gas at 184 C (363 F).
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lanthanum group number