From the elements in this list, identify one in each case that matches the description given. Write the symbol of the element. An element whose molecules are made up of single atoms.
An element whose molecule contains exactly four atoms.
The element that is liquid at room temperature and pressure.
The Period 3 element (Na to Ar) with the greatest atomic radius.
The Period 3 element (Na to Ar) with the highest melting point.
The Period 3 element (Na to Ar) that forms the largest anion.
An element that reacts with water to produce a solution that can act as an oxidising agent.
The formulae and melting points of some oxides of the Period 3 elements, Na to Cl, are given. Give the formulae of two oxides from this set that have simple molecular structures.
Give the formula of one oxide that shows no reaction with water, even after being left in it for a long time.
Give the formula of the product made when $\text{MgO}$ reacts with $\text{SO}_2$.
The melting points of Si to Cl are shown. Explain why silicon has a melting point that is much higher than those of the other three elements.
Suggest why the melting points of the other three elements follow the order $\text{S} > \text{P} > \text{Cl}$.