(a)[5]
Describe the arrangement of the electrons, neutrons and protons in this phosphorus atom; include the numbers of neutrons and protons, and give the electronic configuration.
(b)[2]
Complete the symbol equation for the reaction between phosphorus and oxygen: $\ldots\text{P} + \ldots\text{O}_2 \rightarrow \text{P}_4\text{O}_{10}$
(c)[1]
Deduce the molecular formula from this displayed formula.
(d)[2]
Complete Table 5.1 so that the relative formula mass of $\text{Na}_3\text{PO}_4$ can be calculated.
(e)[1]
Phosphates in rivers can lead to deoxygenation of the water. State one source of phosphates found in river water.