Beryllium and radium are both in Group 2. Draw a diagram to show the metallic bonding in both beryllium and radium. Using your diagram, explain why beryllium has a higher melting point than radium.

Magnesium powder reacts with dilute hydrochloric acid, giving off hydrogen and leaving a solution of magnesium chloride. Write a balanced equation, including state symbols for this reaction.

When lightning strikes during a thunderstorm, the rain that falls is a dilute solution of nitric acid (${\mathrm{HNO}}_3$). Work with a partner to write a balanced chemical equation, including state symbols, to show how slaked lime (calcium hydroxide) added to the soil can neutralise nitric acid.

For the following reaction, state which element is oxidised and which is reduced, and give the changes in oxidation number.

$\mathrm{Sr} + {\mathrm{Cl}}_2 \to {\mathrm{SrCl}}_2$

For the following reaction, state which element is oxidised and which is reduced, and give the changes in oxidation number.

$\mathrm{Sr}+ 2{\mathrm{H}}_2\mathrm{O} \to \mathrm{Sr}{\left(\mathrm{OH}\right)}_2 + {\mathrm{H}}_2$

For the following reaction, state which element is oxidised and which is reduced, and give the changes in oxidation number.

$2\mathrm{Mg} + {\mathrm{CO}}_2 \to 2\mathrm{MgO} + \mathrm{C}$