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The electron configuration of 22X 2 ion is - JAMB Chemistry 2000 Question

The electron configuration of 22X 2+ ion is
A
1s2 2s22p6 3s2 3p6 4s2 3d2
B
1s2 2s22p6 3s2 3p6 4s2 3d1
C
1s2 2s22p6 3s2 3p6
D
1s2 2s22p6 3s2 3p6 4s2
correct option: d
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