Across
- 3. - a subatomic particle with about the same mass as a proton but without the electric charge
- 8. - a helium nucleus emitted from a decaying atom
- 11. - electromagnetic rays emitted when a atom decays
- 13. - a high speed electron emitted during beta decay
- 14. - the central core of an atom consisting of protons and neutrons, making up almost all of its mass
Down
- 1. - a subatomic particle with a positive charge with around the same mass of a neutron
- 2. - when nuclei fuse together to form a heavier nucleus
- 4. - the total number of protons and neutrons in a nucleus
- 5. - a reaction in which a nucleus splits into two suddenly or by the impact of another particle
- 6. - a chemical reaction in which one event causes another
- 7. - the emission of radiation caused by a decaying atom
- 9. - atoms of the same element that have the same number of protons but a different number of neutrons
- 10. - the time taken for a radioactive isotope to decay to half of its original value
- 12. number - the number of protons in the nucleus of an atom