(a(i))[3]
Work out the numbers of electrons, neutrons and protons in the isotope $^{31}_{15}\text{P}$.
(a(ii))[1]
What is meant by the term isotopes?
(b)[1]
Complete the equation for the reaction of phosphorus with potassium chlorate(V): $\dots\,\text{KClO}_3 + \dots\,\text{P} \rightarrow \dots\,\text{KCl} + \dots\,\text{P}_2\text{O}_5$.
(c)[1]
A structure for a phosphorus compound is shown. Deduce the molecular formula of this compound.
(d)[2]
Draw a dot-and-cross diagram for a molecule of phosphorus trichloride, $\text{PCl}_3$. Include only the outer-shell electrons.
(e)[2]
Identify the oxidising agent in the reaction $2\text{P} + 5\text{Cu}^{2+} + 8\text{H}_2\text{O} \rightarrow 5\text{Cu} + 2\text{PO}_4^{3-} + 16\text{H}^+$. Explain your answer.