[Kurukshetra CET 2002]
A) 3
B) 5
C) 4
D) 1
Correct Answer: A
In $ C{{r}^{3+}} $ number of unpaired $ {{e}^{-}}=3 $ .
A electronic configuration of $ C{{r}^{3+}}=1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{3} $ .
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