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Verified answer
13Al = 1s2 2s2 2p6 3s2 3p1periode 3
golongan IIIA
19 K = 1s2 2s2 2p6 3s2 3p6 4s1
periode 4
golongan IA
9F = 1s2 2s2 2p5
periode 2
golongan VII A