(a)[2]
Phosphorus may be produced from calcium phosphate, $\text{Ca}_3(\text{PO}_4)_2$.\n\n$2\text{Ca}_3(\text{PO}_4)_2 + 6\text{SiO}_2 + 10\text{C} \rightarrow 6\text{CaSiO}_3 + 10\text{CO} + \text{P}_4$\n\nWhat is the greatest mass of phosphorus that could be produced from $300\,\text{g}$ of silicon dioxide, $\text{SiO}_2$?
(b)[2]
Phosphorus, $\text{P}_4$, has a simple molecular structure. Suggest two physical properties of phosphorus.
(c)[2]
With reference to structure and bonding, suggest why calcium phosphate, $\text{Ca}_3(\text{PO}_4)_2$, has a high melting point.
(d)[2]
Fill in the table showing the numbers of electrons, neutrons and protons in two particles.