Which of the following pairs are NOT isoelectronic? N3- and P3- S2- and Cl- F- and...

Question

Question

Which of the following pairs are NOT isoelectronic?

N^3- and P^3-

S^2- and Cl^-

F^- and Mg²⁺

Na⁺ and O^2-

Answer 1

Answer #1

Isoelectronic means species which have same number of electrons

N^3- 7+3 = 10 electrons and P^3- 15+3 = 18 electron it is not isoelectronic

S^2- 16+2 = 18 electron and Cl^- 17+1 = 18 electron it is isoelectronic

F^- 9+1 = 10 electron and Mg²⁺ 12-2 = 10 electron it is isoelectronic

Na⁺ 11-1 = 10 electron and O^2- 8+2 = 10 electron it is isoelectronic

So the correct answer is option (A) N^3- and P^3-

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Answer 2

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