The order of filling orbitals is...
A1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p
B1s, 2s, 2p, 3s, 3p, 3d, 4p, 3d
C1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p
D4p, 4s, 3d, 3p, 3s, 2p, 2s, 1s
A1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p
B1s, 2s, 2p, 3s, 3p, 3d, 4p, 3d
C1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p
D4p, 4s, 3d, 3p, 3s, 2p, 2s, 1s
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