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Question

Which of the following is not isoelectronic species

A
Cl, P3, Ar
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B
N3, Ne, Mg2+
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C
B3+, He, Li+
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D
N3, S2, Cl
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Solution

The correct option is D N3, S2, Cl
Isoelectronic species means species containing same number of electrons.
A) all the species has 18 electrons
B) all the species has 10 electrons
C) all the species has 2 electrons

In (d) option N3 has 10 electrons, S2 has 18 electrons and Cl has 18 electrons.

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