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7B --> 1s2 2s2 2p5
10C --> 1s2 2s2 2p6
13D --> 1s2 2s2 2p6 3s2 3p1
37E --> 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5 5s2
jawabannya E