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Question

Chemistry Question on Classification of elements & periodicity in properties

Which among the following is not iso- electronic ?

A

NO−NO^-

B

CN−CN^-

C

N2N_2

D

O22+O^{2+}_2

Answer

NO−NO^-

Explanation

Solution

NO−NO^- has 7 + 8 + 1 = 16 electrons whereas all others have 14 electrons