Atomic Structure Question 109
Question: Which among the following species have the same number of electrons in its outermost as well as penultimate shell [DCE 2004]
Options:
A) $ M{g^{2+}} $
B) $ {O^{2-}} $
C) $ {F^{-}} $
D) $ C{a^{2+}} $
Show Answer
Answer:
Correct Answer: D
Solution:
$ _{20}Ca=2,8,8,2 $
$ C{a^{2+}}= $ 2, 8, 8 Hence, $ C{a^{2+}} $ has 8 electrons each in outermost and penultimate shell.
