Across
- 2. energy released as a particle or a wave
- 5. a negatively charged subatomic particle
- 8. made up of electrons protons and neutrons
- 9. a positively charged subatomic particle
- 11. a space with no particles
Down
- 1. a proton or a neutron
- 3. an atom with an electric charge
- 4. a subatomic particle with no charge
- 6. the act of emitting radiation spontaneously
- 7. smaller than an atom
- 10. the centre of an atom