D-And F-Block Elements Ques 312

Question: The number of unpaired electrons in cobalt atom is (atomic number of Co = 27)

[MP PMT 2003]

Options:

A) 2

B) 3

C) 4

D) 1

Show Answer

Answer:

Correct Answer: B

Solution:

Electronic configuration of $ _{27}Co $ - $ 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{7}4s^{2} $ , hence unpaired $ {{e}^{-}} $ = 3



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