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b. 24Cr = 2, 8, 8, 6
c. 18Ar = 1s2, 2s2, 2p6, 3s2, 3p6
d. 47Ag = 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p6, 5s2, 4d9