Which of the following is the correct order of filling orbitals?
A) 1s, 2s, 2p, 3s, 3p, 3d, 4s
B) 1s, 2s, 2p, 3s, 3p, 4s, 3d
C) 1s, 2s, 3s, 4s, 2p, 3p, 3d
D) none of these
B
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