試題詳解

7. Which one of the following statements is incorrect?
(A) An unknown nonmetal element with a valence electron configuration of ns²np⁴ has a smaller radius than barium.
(B) The set of quantum numbers, n = 4, l = 3, m_l = 4 is not allowed in the hydrogen atom.
(C) A certain oxygen atom with the electron configuration of 1s²2s²2px²2py² has no unpaired electrons.
(D) The order of increasing first ionization energy among K, Br, Ni is: Br ＜ Ni ＜K
(E) (Kr)5s²4d¹⁰5p⁵ is the expected ground-state electron configuration for the element with one unpaired 5p electron that forms a covalent compound with fluorine.