C-03-Q191mediumsingle_mcqThe electronic configuration of Fe\ce{Fe}Fe (Z=26Z = 26Z=26) is:a1s2 2s2 2p6 3s2 3p6 3d6 4s21s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^6\,4s^21s22s22p6b1s2 2s2 2p6 3s2 3p6 4s2 3d81s^2\,2s^2\,2p^6\,3s^2\,3p^6\,4s^2\,3d^81s22s22p6c1s2 2s2 2p6 3s2 3p6 3d81s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^81s22s22p63sd1s2 2s2 2p6 3s2 3p6 4s2 4p61s^2\,2s^2\,2p^6\,3s^2\,3p^6\,4s^2\,4p^61s22s22p6