#2.1.1
Classification
An element is classified as s, p, d or f block according to its position in the Periodic Table, which is determined by its proton number.
#2.1.2
Physical properties of Period 3 elements
The trends in atomic radius, first ionisation energy and melting point of the elements Na–Ar
The reasons for these trends in terms of the structure of and bonding in the elements.
Students should be able to:
- explain the trends in atomic radius and first ionisation energy
- explain the melting point of the elements in terms of their structure and bonding.