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1s²
2s² 2p⁶
3s²
periodo = 3
grupo = IIA
Valencia = +2
Z = 53 YODO
1s²
2s² 2p⁶
3s² 3p⁶ 3d¹⁰
4s² 4p⁶ 4d¹⁰
5s² 5p⁵
periodo = 5
grupo = VIIA
Valencia = +/- 1 , +5, +7