The second ionisation energy of oxygen is higher than the second ionisation energy of fluorine. Which factor accounts for this difference?
- AThe atomic radius of an oxygen atom is smaller than that of fluorine.
- BThe covalent bond in a fluorine molecule is weaker than the bond in an oxygen molecule.
- CA spin-paired electron is removed from fluorine but not from oxygen.
- DFluorine has more electrons in total than oxygen. This causes a greater shielding of the nuclear attraction in fluorine.