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Potasio Z=19 ..............1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
Galio Z=31...................1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹
Cloro Z=17...................1s² 2s² 2p⁶ 3s² 3p⁵