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b. 19K = 1s2 2s2 2p6 3s2 3p6 4s1
c. 26Fe = 1s2 2s2 2p6 3s2 3p6 4s2 3d6
d. 35Br = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5