Atomic Structure Question 394

Question: Which of the following should be the number of electrons present in $ {X^{2+}} $ on the basis of electronic configuration, if the ion $ {X^{3-}} $ has 14 protons-

Options:

A) 12

B) 14

C) 16

D) 18

Show Answer

Answer:

Correct Answer: A

Solution:

  • $ {X^{3-}} $ has 14 protons, i.e., X also has 14 protons and therefore 14 electrons. $ X=14=1s^{2},2s^{2}2p^{6},3s^{2}3p^{2} $

$ {X^{2+}}=1s^{2},2s^{1}2p^{6},3s^{2}=12 $ electrons



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