A student writes three statements about how elements are classified into groups.
Statement 1: hydrogen is an alkali metal, because its atom has one electron in its outer shell
Statement 2: argon is in group 0, because its atoms have a full outer shell of electrons
Statement 3: helium is in group 2, because its atom has two electrons in its outer shell
Which statements are correct?
2 only
1 and 2 only
2 and 3 only
1, 2 and 3
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.