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  4. How many 'd' electrons are present in Cr2+ ion ?

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

EAMCETEAMCET 2002The d-and f-Block Elements

Solution:

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