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Q.

Which of the following is not isoelectronic

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a

Na+

b

Mg2+

c

O2-

d

CI-

answer is D.

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Detailed Solution

Na+=1s22s22p6=10e−Mg++=1s22s22p6=10e−O2−=1s22s22p6=10e−Cl−=1s22s22p63s23p6=18e-
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