Define what the term transition element means.
For each of the complexes below, state the co-ordination number and the oxidation number of the transition element present:\n$[\text{Ni(CN)}_2(\text{NH}_3)_2]$\n$[\text{CrCl}_2(\text{H}_2\text{O})_4]^+$.
State the kind of bonding present between the ligand and the metal ion in these complexes.
Suggest the structure of $[\text{Ni(CN)}_2(\text{NH}_3)_2]$ and give its shape.
The complex ion $[\text{Cr(H}_2\text{O})_6]^{3+}$ can be changed into $[\text{CrCl}_2(\text{H}_2\text{O})_4]^+$. Suggest a suitable reagent for this conversion.
State the type of reaction shown in part (c)(i).
The $[\text{CrCl}_2(\text{H}_2\text{O})_4]^+$ complex ion shows stereoisomerism. Name this form of stereoisomerism.
Draw 3D diagrams to show the two stereoisomers of $[\text{CrCl}_2(\text{H}_2\text{O})_4]^+$.