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.



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