Question

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

• A. 4
• B. 5
• C. 6
• D. 3

Answer 1

Answer: (A)

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