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Final NB 2016-2017 Turley

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Ion Size<br />

Define Ion Size:<br />

Ionic size tends to increase from top to bottom within a group. Generally, the size of cation<br />

and anions decrease from left to right across a period.<br />

size generally<br />

increase<br />

Size of cations decrease<br />

Size of anions decrease<br />

Explanation:<br />

During reactions between metals and nonmetal, metal atoms tend to lose electrons and<br />

nonmetal atoms tend to gain electrons. The transfer of electrons has a predictable effect on<br />

the size of ions that form. Cations are always smaller than the atoms from which they form.<br />

Anions are always larger than the atoms from which they form.<br />

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