2. The Periodic Table
Key learning objectives
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gcse · chemistry · OCR · All papers
Releases 1 August 2026
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Flame-test method
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Subatomic particles in an atom
| protons (particles) | neutrons (particles) | electrons (particles) |
|---|---|---|
| 17 | 18 | 17 |
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Electronic structures of Group 1 elements
| element (element) | electronic structure (shells) |
|---|---|
| lithium | 2,1 |
| sodium | 2,8,1 |
| potassium | 2,8,8,1 |
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Group 1 reaction observations
| element (element) | outer electrons (electrons) | time to melt on water (s) |
|---|---|---|
| lithium | 1 | 48 |
| sodium | 1 | 18 |
| potassium | 1 | 5 |
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