This question requires use of the Data Booklet. Among sodium, magnesium, aluminium, silicon, phosphorus, sulfur and chlorine, which element: • has a lower first ionisation energy than 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