A laboratory prepares two samples of element X with different isotopic compositions. The table gives information about the samples.
| Isotope | Mass number | Number of protons | Percentage abundance in Sample A (%) | Percentage abundance in Sample B (%) |
|---|---|---|---|---|
| X-35 | 35 | 17 | 60 | 90 |
| X-37 | 37 | 17 | 40 | 10 |
Calculate the relative atomic mass of element X in Sample A.
A technician claims that using Sample B would cause element X to be moved to an earlier position in the modern periodic table.
Evaluate this claim. Use the data in the table.
82 exam-style questions on AQA GCSE Chemistry 1.2 The periodic table, covering 1.2.1 The periodic table, 1.2.2 Development of the periodic table, 1.2.3 Metals and non-metals, 1.2.4 Group 0, 1.2.5 Group 1, and 1.2.6 Group 7. Each one has a worked solution and a mark scheme showing where the marks go.