A student adds pieces of lithium, sodium and potassium of the same mass to water. The student records the time taken for each piece to react completely.
| Element | Electronic structure | Time to react completely (s) |
|---|---|---|
| Lithium | 2.1 | 60 |
| Sodium | 2.8.1 | 15 |
| Potassium | 2.8.8.1 | 3 |
Which conclusion is best supported by these results?
The time taken decreases by the same factor for each extra occupied shell.
Reactivity increases as the number of outer shell electrons increases.
Reactivity increases as the number of occupied electron shells increases.
Rubidium, 2.8.18.8.1, would take longer than 3 s to react completely.
64 exam-style questions on OCR GCSE Chemistry 2.2 Bonding, covering 2.2.1 Metals, non-metals and the Periodic Table, 2.2.2 Types of chemical bonding and dot and cross diagrams, 2.2.3 Limitations of bonding models, and 2.2.4 Reactivity, atomic number and the modern Periodic Table. Each one has a worked solution and a mark scheme showing where the marks go.