This key facts covers Isotopes within Atomic Structure for GCSE Physics. Revise Atomic Structure in Atomic Structure for GCSE Physics with 13 exam-style questions and 25 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 5 of 12 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 5 of 12
Practice
13 questions
Recall
25 flashcards
🔄 Isotopes
Definition: Isotopes are atoms of the same element (same number of protons) with different numbers of neutrons.
Examples — Carbon isotopes:
| Isotope | Protons | Neutrons | Stable? |
|---|---|---|---|
| Carbon-12 | 6 | 6 | Yes (99%) |
| Carbon-13 | 6 | 7 | Yes (1%) |
| Carbon-14 | 6 | 8 | No (radioactive) |
Key points:
- Same chemical properties (same electrons)
- Different physical properties (different mass)
- Some isotopes are radioactive (unstable nucleus)