Question

How many 'd' electrons are present in $Cr^{2+}$ ion ?

• A. 4
• B. 5
• C. 6
• D. 3

Answer 1

Answer: (A)

4

Answer 2

$Cr^{2+} : [Av]^{18} \, 3d^4$
$Cr^{2+}$ has 4 electron in $3d$-subshell
Thus, there are four $3d$-electrons in $Cr^{2+}$