In an investigation into alkaline battery components, a student compares the reactivity of lithium and potassium. Both elements are located in Group 1 of the periodic table.
Explain, in terms of electrons, why lithium and potassium are placed in the same group.
80 exam-style questions on Edexcel GCSE Chemistry 2.2 The periodic table, covering 2.2.1 Mendeleev's periodic table, 2.2.2 Periods, groups, metals and non-metals, and 2.2.3 Electronic configuration and position in the periodic table. Each one has a worked solution and a mark scheme showing where the marks go.