(a)[2]
Complete the electronic configurations for Cu and $\text{Cu}^{2+}$.
(b(i))[1]
The $3d$ orbitals in an isolated $\text{Cu}^{2+}$ ion are degenerate. Explain what is meant by degenerate in this situation.
(b(ii))[1]
Complete the diagram showing the splitting of the $3d$ orbital energy levels in an octahedral complex.
(c(i))[1]
1,2-diaminoethane, $\text{H}_2\text{NCH}_2\text{CH}_2\text{NH}_2$, $en$, acts as a bidentate ligand. Explain what is meant by bidentate.
(c(ii))[2]
The $\text{Cu}^{2+}$ ion and $en$ form the complex ion $[\text{Cu}(en)_3]^{2+}$. Draw the two optical isomers of this complex ion. You may use the given representation to show $en$.