Nihonium, Nh, has only just been discovered. Its atomic radius and melting point could not be measured because it is too radioactive. Estimate the atomic radius of Nh.
Explain, using data from the table, why estimating the melting point of nihonium is difficult.
Boron has a giant covalent structure. Explain why boron has a high melting point.
Aluminium is made by the electrolysis of molten aluminium oxide. Aluminium oxide contains Al$^{3+}$ and O$^{2-}$ ions. Describe the composition of the electrolyte used in this electrolysis.
Name the material used for the electrodes in this electrolysis.
Write equations for the reactions occurring at the: negative electrode positive electrode.
Aluminium reacts with aqueous copper(II) chloride in a redox reaction. $\text{2Al(s)} + \text{3Cu}^{2+}(aq) \rightarrow \text{2Al}^{3+}(aq) + \text{3Cu(s)}$ Which particle is oxidised? Explain your answer.
Explain why a piece of aluminium in water does not react.
Aluminium chloride is a soluble salt. Describe how a pure sample of aluminium chloride crystals can be made from aluminium.