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y = 2, 8, 8 -> periode 3, golongan 8
z = 2, 8, 18, 8, 2 -> periode 5 golongan 2
18Y⇒1s2 2s2 2p6 3s2 3p6 golongan 8A periode 3
38Z⇒1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 golongan 2A periode 5