Chp. 5 Vocabulary Terms

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Alkali metals

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One of the elements of group 1 of the periodic table.

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Alkaline-earth metals

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One of the elements of group 2 of the periodic table.

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Anion

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An ion that has a negative charge.

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Atomic Radius

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One-half of the distance between the center of identical atoms that are not bonded together.

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Cation

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An ion that has a positive charge.

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Electronegativity

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A measure of the ability of an atom in a chemical compound to attract electrons.

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Electron Affinity

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The energy needed to remove an electron from a negative ion to form a neutral atom or molecule.

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Halogens

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One of the elements of group 17.

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Ion

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An atom, radical, or molecule that has gained or lost one or more electrons and has a negative or positive charge.

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Ionization Energy

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The energy required to remove an electron from an atom or ion.