Phosphorus is in Group V of the Periodic Table. Explain why phosphorus is classified in this group.
Fill in Table 3.1 with the numbers of protons, neutrons and electrons in one atom of each isotope.
Phosphorus reacts with oxygen to form phosphorus(V) oxide. Complete the symbol equation for this reaction. $\dots\text{P} + \dots\text{O}_2 \rightarrow \text{P}_4\text{O}_{10}$
State whether phosphorus(V) oxide is acidic or basic oxide, and give a reason for your choice.
Phosphorus is one element in NPK fertilisers. Draw a circle around one other element that is also found in NPK fertilisers. krypton nickel platinum potassium
State why farmers apply fertilisers to fields where crops are grown.
Complete Table 3.2 to work out the relative formula mass of Ca$_3$(PO$_4$)$_2$.