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one of the horizontal rows, all of whose elements have the same number of electron shells

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is a column of elements in the periodic table of the chemical elements

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is any of the elements found in Group IA of the periodic table

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are six chemical elements in group 2 of the periodic table

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The lanthanides include elements having atomic numbers 57

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Any of a series of chemically similar metallic elements with atomic numbers ranging from 89

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Any of the metallic elements within Groups 3 through 12 in the Periodic Table

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Any of the elements in Group O of the periodic table, including helium, neon, argon, krypton, xenon, and radon