Which ion has smallest radius?
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Because K+ has the greatest nuclear charge (Z = 19), its radius is smallest, and S2− with Z = 16 has the largest radius. Because selenium is directly below sulfur, we expect the Se2− ion to be even larger than S2−.
Ionic Radii and Isoelectronic Series.
Ion Radius (pm) Atomic Number
N3− 146 7
O2− 140 8
F− 133 9
Na+ 98 11
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