Across
- 2. To break down and emit nuclear radiation
- 4. Nuclear radiation made from 2 protons and 2 neutrons
- 6. The building blocks of matter
- 8. The centre of an atom
- 10. An unstable element that with undergo nuclear decay
- 11. A high frequency electromagnetic wave
- 12. To have electrons removed from the atom
Down
- 1. A high speed electron ejected from the nucleus
- 3. 3mm of this can stop beta
- 5. Can block alpha particles
- 7. A different form of an element with more or fewer neutrons
- 8. An uncharged sub atomic particle
- 9. Several cms of this are needed to reduce gamma