1. Electronic configuration of
Mn is
3d5,4s2 and hence, it exhibits +7 oxidation state.
2. Zinc does not form coloured ions as it has completely filled
3d10,4s2 configuration.
3. In
[CoF6]3−, fluoride is a weak field ligand and hence, does not cause pairing of electrons in
d7 system of
Co3+. Thus, the complex is paramagnetic.
Electronic configuration of
Co3+ is
4. Sc has outer configuration of
3d14s2, hence it can form a maximum of +3 oxidation state.
5. Zn exhibits only +2 oxidation state as in this it is the most stable.