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K. 1. S2 = 2
L. 2. S2 P6 = 8
M. 3. S2 P1 D = 3
= 13
Periode 3
Golongan 3A
(Karena jumlah kulit ada (K, l, M)
Dan n S2 n P1 maka termasuk golongan 3A)