Question

Electronic Configuration Z=21?? ?????​

Answer 1

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Answer 2

Explanation:

the differences start to matter at Z = 21, scandium – the beginning of the transition metals. For Z = 20, calcium, the (n + l) rule says: the 4s orbital is lower energy than the 3d orbital. the 4s orbital is occupied and the 3d orbitals are not (1s2 2s2 2p6 3s2 3p6 4s2).