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La=57 → 1s²2s²2p6 3s²3p6 3d10 4s²4p6 4d10 5s² 5p6 5d¹ 6s² →nivel 6
Fe=26 → 1s²2s²2p6 3s²3p6 3d6 4s² →nivel 4
Se=34 → 1s²2s²2p6 3s²3p6 3d10 4s² 4p4 ↑→ nivel 4