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golongan 8B periode 4
51 Y = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 4p3
golongan 5A periode 5
64 Z = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 4p6 6s2 4f8
golongan 3B
periode 6