Bromine displaces iodine from potassium iodide solution.
Which statement explains why bromine is more reactive than iodine?
A bromine atom has more outer-shell electrons, so it gains the electron it needs more easily
A bromine atom is smaller, so it loses its outer-shell electrons more easily than iodine
A bromine atom has fewer occupied shells, so an electron is gained into a shell nearer the nucleus
A bromine atom has more protons in its nucleus, so it attracts an extra electron more strongly
106 exam-style questions on Edexcel GCSE Chemistry 7.2 Group 7, covering 7.2.1 Physical properties of the halogens, 7.2.2 Reactions of the halogens, 7.2.3 Relative reactivity and displacement reactions of the halogens, and 7.2.4 Halogen displacement as a redox reaction. Each one has a worked solution and a mark scheme showing where the marks go.