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24Cr = 1s2 2s2 2p6 3s2 3p6 4s2 3d4
29Cu = 1s2 2s2 2p6 3s2 3p6 4s2 3d9
31 Ga = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
21Sc = 1s2 2s2 2p6 3s2 3p6 4s2 3d1