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Question

Which of the following species is not isoelectronic with the others?

A
Na+
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B
Mg2+
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C
O2
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D
Cl
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Solution

The correct option is D Cl
Isoelectronic species are those which have the same number of electrons.
Electrons in Na+=10
Electrons in Mg2+=10
Electrons in O2=10
Electrons in Cl=18
So, Cl ion is not isoelectronic with the other options.

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