Highest oxidation state of manganese in fluoride is +4 (MnF4) but highest oxidation state in oxides is +7 (Mn2O7) because ____________.
1
fluorine is more electronegative than oxygen.
2
fluorine does not possess d-orbitals.
3
fluorine stabilises lower oxidation state.
4
in covalent compounds fluorine can form single bond only while oxygen forms double bond.