Why does Group 1 reactivity increase down the group?
The outer electron is closer to the nucleus, so is lost more easily
The nuclear charge increases, so the outer electron is held more tightly
The atoms gain an extra electron more easily to fill the outer shell
The outer electron is further from the nucleus, so is lost more easily
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.