Across
- 2. Who first suggested the quantum theory
- 4. A dense metal
- 5. Designed the alpha-particle scattering experiment
- 6. Unit for very small distances
- 8. Charge on a proton
- 9. It´s got a double positive charge
- 11. This number is the number of nucleons in the nucleus
- 12. This number is the number of protons in the nucleus
Down
- 1. No charge
- 2. A quantum of light
- 3. Unit for energy
- 6. Charge on an electron
- 7. It´s an electron
- 10. High energy radiation