Can I have help on this transition metals question please, I have tried it but am stuck on the circled parts.
(b) Vanadium ions have four common oxidation states. Table 18.1 shows the colours of the ions in aqueous solution.
(i) Complete the electron configuration of a v3+ ion.
(ii) The student adds excess iron to a solution containing VO2+(aq) ions, and observes that the colour of the solution changes from blue to green and then to voilet. Use the relevant standard electrode potentials shown in Table 18.2 to explan these observations.
(iii) Construct an equation for the first colour change from blue to green