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
