Explain the bonding and structure of phosphorus pentoxide (P2O5).

Phosphorus pentoxide (P2O5) has a molecular structure where each phosphorus atom is bonded to four oxygen atoms, forming a trigonal bipyramidal shape. The bonding involves covalent bonds between phosphorus and oxygen, resulting in a solid with a relatively low melting point compared to silicon dioxide. This answer is anchored to Period 3 oxides (A-level only).

Phosphorus pentoxide (P2O5) has a molecular structure where each phosphorus atom is bonded to four oxygen atoms, forming a trigonal bipyramidal shape. The bonding involves covalent bonds between phosphorus and oxygen, resulting in a solid with a relatively low melting point compared to silicon dioxide. is the best answer because it directly supports the AQA A-Level Chemistry objective to describe the bonding and structure of Period 3 oxides. This reasoning is anchored to Period 3 oxides (A-level only) in Properties of Period 3 elements and their oxides (A-level only), and it separates Period 3 oxide from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.