The Data Booklet may be needed to answer this question. Among the elements sodium, magnesium, aluminium, silicon, phosphorus, sulfur and chlorine, which one • has a first ionisation energy that is lower than that of the element immediately before it in the Periodic Table, • conducts electricity, and • has a smaller atomic radius than the element immediately before it in the Periodic Table?
- Aaluminium
- Bmagnesium
- Cphosphorus
- Dsulfur