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 $
Show Answer
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 $ .
