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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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alkaline-earth metals

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any of the series of elements with increasing atomic numbers that begins with actinium or thorium and ends with lawrencium

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he halogens or halogen elements (/ˈhælədʒən, ˈheɪ-, -loʊ-, -ˌdʒɛn/) are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

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It consists of the elements nitrogen

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are the chemical elements in group 13 of the periodic table

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metals are a group (column) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K), [note 1] rubidium (Rb), caesium (Cs), [note 2] and francium (Fr)

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any of the seven chemical elements that make up Group 18

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The 38 elements in groups 3 through 12 of the periodic table are called "transition metals

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is a periodic table group consisting of carbon(C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), and flerovium (Fl).

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It consists of the elements oxygen

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

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a length or portion of time.