Potassium is more reactive than calcium. Which statement explains why?
A potassium atom loses its outer electron more easily than a calcium atom does.
A potassium atom has more occupied electron shells than a calcium atom has.
A potassium atom gains electrons more easily than a calcium atom does.
A potassium ion has a larger positive charge than a calcium ion has.
39 exam-style questions on AQA GCSE Chemistry 4.1 Reactivity of metals, covering 4.1.1 Metal oxides, 4.1.2 The reactivity series, 4.1.3 Extraction of metals and reduction, and 4.1.4 Oxidation and reduction in terms of electrons. Each one has a worked solution and a mark scheme showing where the marks go.