Element X has atomic number 12. Which statement is correct?
X is in Period 2 because it has two outer electrons
X is in Group 3 because it has three shells
X is in Group 2 because it has two outer electrons
X is in Group 0 because its outer shell is full
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.