Periodic TableHard

Question

Which one of the following is the smallest in size ?

Options

A.N3-
B.O2-
C.F-
D.Na+

Solution

All the ions have E.C. ls2, 2p2, 2p6 but to maximum ENC, Na+ is smallest. Also remember in the species having same number of shells, cation is always smaller than neutral atom or anion.

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