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Question

Arrange the following in order of increasing radii :

(a) Cl,Cl (b) Mg2+,Mg,Mg+ (c) N, O, P

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Solution

a) Cl- will be larger than Cl
b) Mg>Mg+>Mg+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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