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19K = 1s2 2s2 2p6 3s2 3p6 4s1
5B = 1s2 2s2 2p1
9F = 1s2 2s2 2p5
29A = 1s2 2s2 2p6 3s2 3p6 4s1 3d10 (lihat nama unsur A dgn Nomor Atom : 29)
semoga membantu :-)