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Any of the seven chemical elements that make up Group 18.

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Elements that form Group 17.

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Elements that make up Group 16.

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Found in Group 15 in the periodic table.

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Found in Group 14.

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Elements that form Group 13.

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A series of metallic elements, included in the rare-earth metals, in Group 3 of the periodic table.

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The transition metals are the metallic elements that serve as a bridge between the two sides of the periodic table.

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Alkaline-earth metals are in Group 2 in the periodic table,

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Alkali metals are the chemical elements in Group 1 in the periodic table.

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A period is the name given to a horizontal row of the periodic table

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Family refers to a group of elements with similar chemical properties.