Use only the elements listed in the table when answering this question. State which two of P, Q, R, S and T are covalent molecules. Give two reasons for your choice.
Describe how metallic character changes with position in the Periodic Table.
Potassium is a Group I element in the Periodic Table. Cobalt is a transition element, and cobalt has a higher density than potassium. Give two further ways in which the properties of transition elements differ from those of Group I elements.
State whether potassium oxide is a basic oxide or an acidic oxide, and briefly justify your choice.
The table shows how easily four metal oxides are reduced when heated with carbon. Arrange the four metals in order of reactivity, starting with the least reactive metal first.
Describe how aqueous sodium hydroxide can be used to test for chromium(III) ions, Cr$^{3+}$.