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12 mg
1s2 2s2 2p6 3s2
16 s
1s2 2s2 2p6 3s2 3p4
20ca
1s2 2s2 2p6 3s2 3p6 4s2
24 cr
1s2 2s2 2p6 3s2 3p6 4s2 4p4
29 cu
1s2 2s2 2p6 3s2 3p6 4s2 3d9
31 ga2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
good luck !!