Gallium is a metal in Group 13 of the Periodic Table.

1. (a)(i)State, with reference to subatomic particles, how the isotopes ⁶⁹Ga and ⁷¹Ga differ from each other.[1]
2. (a)(ii)State what further information is needed to calculate the relative atomic mass of gallium.[1]
3. (b)(i)At 500°C, gallium trichloride is a gas. Suggest the type of attraction that exists at 500 °C • between atoms within a gallium trichloride molecule • between gallium trichloride molecules.[2]
4. (b)(ii)When gallium trichloride is cooled a solid, Ga₂Cl₆, forms. Suggest the name of the attraction formed between two gallium trichloride molecules to form Ga₂Cl₆.[1]
5. (c)(i)Suggest an equation to describe the reaction occurring when gallium metal is exposed to air.[2]
6. (c)(ii)The table gives the formula of each gallium-containing product formed when gallium oxide reacts separately with hot aqueous hydrochloric acid and hot aqueous sodium hydroxide. formula of gallium-containing product hot aqueous hydrochloric acid GaCl₃ hot aqueous sodium hydroxide NaGa(OH)₄ Give the name of the type of behaviour shown by gallium oxide in these reactions.[1]