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Litio ⇔ [He] 2s1 ⇔ 1 ⇔ 2
Magnesio ⇔ [Ne] 3s2 ⇔ 2 ⇔ 3
Aluminio ⇔ [Ne] 3s2 3p1 ⇔ 13 ⇔ 3
Cromo ⇔ [Ar] 3d5 4s1 ⇔ 6 ⇔ 4
Hierro ⇔ [Ar] 3d6 4s2 ⇔ 8 ⇔ 4