Explicación:
1s² 2s² 2p6 3s² 3p6 4s² 3d10 4p6 5s² 4d10 5p6 6s² 4f7 5d10 6p6 7s² 5f7 6d4
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Explicación:
1s² 2s² 2p6 3s² 3p6 4s² 3d10 4p6 5s² 4d10 5p6 6s² 4f7 5d10 6p6 7s² 5f7 6d4