1.1. The properties of elements and their compounds show similarities, differences and trends depending on the positions of the elements in the Periodic Table.

i) Define ionic radius. 

[1]

 ii) Explain how ionic radius differs between cations and anions in terms of the parent atoms. 

[4]

1.2. On Fig. 2.1, sketch a graph to show the trend in the ionic radius of successive elements in Period 3. 

Fig. 2.1

1.3. Explain the trend shown in part (b).