A.2D3/2→2P1/2 B.2P1/2→3S1/2 C.2F5/2→2D3/2 D.2P3/2→2S1/2
A.2D3/2→2S3/2 B.2P1/2→3D1/2 C.2P3/2→2S1/2 D.1P1→1S0