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Halogens are very reactive nonmetals because their atoms need to gain only one electron to have a complete outer level.

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This group is also known as the nitrogen family. It consists of the elements nitrogen(N), phosphorus (P), arsenic (As).

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The Boron Group are the chemical elements in group 13 of the periodic table.

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lanthanide series, 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 are less reactive than alkali metals are. Atoms of alkaline-earth metals have two outer-level electrons.

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Noble gases are unreactive nonmetals and are in group 18 of the periodic table.

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This group is also known as the oxygen family. It consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te)

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The series always includes the 14 elements with atomic numbers 90 through 103.

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Some transition metals,such as titanium in the artificial hip at right, are not very reactive.

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The alkali 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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A period is the name given to a horizontal row of the periodic table. The periodic table has seven periods

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A family or group is a column of elements in the periodic table of the chemical elements.

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The carbon group is a periodic table group consisting of carbon(C), silicon (Si), germanium (Ge).