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Q)

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

$(a)\;4\qquad(b)\;5\qquad(c)\;6\qquad(d)\;3$

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A)
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4 'd' electrons are present in $Cr^{2+}$ ion. Electronic configuration of $Cr^{2+}$ is$1s^2 2s^2 2p^6 3s^2 3p^6 4s^0 3d^4$
Hence (a) is the correct answer.
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