Atomic Structure Question 108

Question: The compound in which cation is isoelectronic with anion is

Options:

A) $ NaCl $

B) $ CsF $

C) $ NaI $

D) $ K_2S $

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Answer:

Correct Answer: D

Solution:

$ K_2S $ formed by $ {K^{+}} $ and $ {S^{2-}} $ ion.

We know that atomic number of K is 19 and in $ {K^{+}} $ ion its atomic number would be 18 similarly atomic number of S is 16 and in form $ {S^{2-}} $ ion its atomic number would be 18 so the $ {K^{+}} $ and $ {S^{2-}} $ are isoelectronic with each other in $ K_2S $ .



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