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Question

Which one of following species are isoelectronic? S2−, Na+, Ca2+,Cl−

A
S2, Na+, Ca2+,Cl
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B
Na+, Ca2+,Cl
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C
S2, Na+,Cl
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D
S2, Ca2+,Cl
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Solution

The correct option is D S2, Ca2+,Cl
Among the given species, S2, Ca2+,Cl all are isoelectronic with 18 electrons while Na+ has only 10 e.


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