Across
- 1. Has a mass of 4 amu
- 3. This number is conserved
- 6. Has different number of neutrons
- 11. These are produced during β– decay
- 12. Particles with a continuous range of energies
Down
- 2. This is the antiparticle of an electron
- 4. These are produced during β+ decay
- 5. Alpha particles have this energy
- 7. Electrons are in _______ around the nucleus
- 8. The correct unit of mass is the _______ mass unit
- 9. Discovered with alpha particle scattering
- 10. Most penetrating radiation