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Any of the seven horizontal rows that contain elements arranged in order of increasing atomic number

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Any of the elements found in Group IA of the periodic table

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They are grouped apart from the rest of the elements in the Periodic Table because they all behave in a similar way in chemical reactions.

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Any of the elements beryllium, magnesium, calcium, strontium, barium, and radium, occupying Group IIA (2) of the periodic table

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A vertical column that contains elements having the same number of electrons in the outermost shell of their atoms.

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Any of the set of metallic elements occupying a central block in the periodic table, manganese, chromium, and copper. Chemically they show variable valence and a strong tendency to form coordination compounds, and many of their compounds are colored.

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any of the chemically inert gaseous elements of group 8A or 0 of the periodic table: helium, neon, argon, krypton, xenon, and radon. Expand. Also called inert gas.

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Any of a series of chemically similar radioactive elements with atomic numbers