Lithium, sodium, and potassium are Group 1 alkali metals.
Describe two observations you would make when a small piece of potassium is added to a trough of water containing a few drops of phenolphthalein indicator.
75 exam-style questions on Edexcel GCSE Chemistry 7.1 Group 1, covering 7.1.1 Classifying elements by group in the periodic table and 7.1.2 Properties and reactions of the alkali metals. Each one has a worked solution and a mark scheme showing where the marks go.