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1s²
2s² 2p⁶
3s² 3p⁶ 3d¹⁰
4s² 4p⁶ 4d¹⁰ 4f¹⁴
5s² 5p⁶ 5d¹⁰ 5f⁶
6s² 6p⁶
7s²
periodo: 7
grupo 8 (VIIIB)
valencias: 3, 4, 5, 6