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Z = 30 (ZINC)
1s²
2s² 2p⁶
3s² 3p⁶ 3d¹°
4s²
Z = 44 (rutenio)
1s²
2s² 2p⁶
3s² 3p⁶ 3d¹°
4s² 4p⁶ 4d⁷ 4f²
5s¹