An analytical chemist is classifying a series of alkaline earth metals. A reference table of several Group 2 elements is shown below:
| Group 2 element | Atomic number | Relative atomic mass |
|---|---|---|
| beryllium | 4 | 9.0 |
| magnesium | 12 | 24.3 |
| calcium | 20 | 40.1 |
| strontium | 38 | 87.6 |
Explain, in terms of their electronic configurations, why these elements are placed in Group 2 of the periodic table.
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.