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Question

Which of the following is not an isoelectronic species?


A

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B

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C

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D

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Solution

The correct option is D


Isoelectronic species are the species which have the same number of electrons.
Let's check out number of electrons in each option.

Cl 17 + 1 = 18 electrons

P3 15 + 3 = 18 electrons

Ar 18 electrons

Yes


N3 N3 7 + 3 = 10 electrons

Ne 10 electrons

Mg+2 12 2 = 10 electrons

Yes


B B+3 5 3 = 2 electrons

He 2 electrons

Li+ 3 1 = 2 electrons

Yes

S2 16 + 2 = 18 electrons

N3 N3 7 + 3 = 10 electrons

S2 S2 16 + 2 = 18 electrons

Mg Mg+2 17 + 1 = 18 electrons


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