Answer:
Aluminium, Indium and Gallium, Thallium
Step-by-step explanation:
Chemical similarities exists between elements found within the same periodic groups because they all have the same valency.
The valency of elements determines their chemical properties as we journey up or down the periodic table.
It is norm and widely accepted assertion that elements in the same groups have the same chemical properties.
The oxidation state of group III elements is usually the +3 state and this makes them stable.
All elements in this group will behave the same way chemically.