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The Ionic radii decrease down period until you reach atom that have tendency to become Anion. Then it decreases down the period again for anion as well. For Example,

Na+ (99), Mg2+ (72), Al3+ (53), P3- (212), S2- (184), Cl- (181)

The value given, in picometers (pm), are ionic radii for the ions.

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14y ago

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