Arrange the following in order of increasing radii :

(a) $C l^{-}, C l$ (b) $M g^{2 +}, M g, M g^{+}$ (c) N, O, P

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Solution

a) Cl- will be larger than Cl
b) Mg> $M g^{+}$ > $M g^{+ 2}$

(c)
Atomic size decreases across the period (due to effective nuclear charge) and increases down the group (due to addition of new shells)
P >N>O

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