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37 Rb : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1
13 Al : 1s2 2s2 2p6 3s2 3p1
53 I : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p5