Which row is the correct one?
- AThe first ionisation energy of phosphorus is greater than that of magnesium / electron is lost from a $3p$ orbital in both cases
- BThe melting point of phosphorus is greater than that of magnesium / phosphorus has more valence electrons than magnesium
- CThe atomic radius of phosphorus is smaller than that of magnesium / phosphorus has greater nuclear charge than magnesium
- DThe electrical conductivity of phosphorus is smaller than that of magnesium / bonding changes from ionic in magnesium to covalent in phosphorus