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  4. The valence shell electronic configuration of Cr2+ ion is

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Q. The valence shell electronic configuration of $Cr^{2+}$ ion is

The d-and f-Block Elements

Solution:

Electronic configuration of chromium
$ Cr\to\left[Ar\right]3d^{5}4s^{1}$
$ Cr^{+2}\to\left[Ar\right]3d^{4}4s^{0}$