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
