1s2 2s22p6 3s2 3p6 4s2 3d2
1s2 2s22p6 3s2 3p6 4s2 3d1
1s2 2s22p6 3s2 3p6
1s2 2s22p6 3s2 3p6 3d2
Correct answer is D
22X2+ has 22 electrons but has been ionized to 2+ by giving off 2 electrons. Hence, the ion 22X2+ has 20 electrons.
The electronic configuration = 1s2 2s2 2p6 3s2 3p6 3d2
the general trend for the first-row transition metals is that they lose electrons from their 4s orbitals first before 3d when forming ions. but this is not true for chromium and copper due to stability related to half-filled or completely-filled 3d orbitals
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