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26Fe 1s2 2s2 2p6 3s2 3p6 4s2 3d6
26Fe K2 L8 M14 N2
46Ag 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s1
46Ag K2 L8 M18 N17 O2