Chemistry · May / June 2018 · Paper 12 · Question 6

The diagrams show the arrangement of particles in three solids: X, Y and Z. The three solids are krypton, potassium and sodium chloride. [diagrams: X shows alternating + and - ions in a lattice; Y shows + ions with e- between them; Z shows closely packed circles] Which row correctly identifies X, Y and Z?

1. AX krypton, Y potassium, Z sodium chloride
2. BX krypton, Y sodium chloride, Z potassium
3. CX sodium chloride, Y krypton, Z potassium
4. DX sodium chloride, Y potassium, Z krypton

As printed in the paper