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K 19 = 2,8,8,1 kulit=4 elektron valensi=1
C 20 = 2,8,8,2 kulit=4 elektron valensi=2
Br 35 = 2,8,18,7 kulit=4 elektron valensi=7
Kr 36 = 2,8,18,8 kulit=4 elektron valensi=8
18K=1s2 2s2 2p6 3s2 3p6; kulit=3; orbital=9; e valensi=8
20Ca=1s2 2s2 2p6 3s2 3p6 4s2; kulit=4; orbital=10; e valensi=2
12Se=1s2 2s2 2p6 3s2; kulit=3; orbital=6; e valensi=2
35Br=1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5; kulit=4; orbital=18; e valensi=7
26Kr=1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6; kulit=4; orbital=18; e valensi=8