Across
- 7. Term used to describe materials that give out nuclear radiation
- 8. Piece of equipment used to measure radiation.
- 12. Gamma rays have a very ________ frequency.
- 13. Materials that are radioactive have nuclei that are ____________.
- 15. During alpha decay, the __________ __________ of the element decreases by 4.
- 17. Emitting gamma rays causes a nucleus to ________ it's energy state.
- 18. Type of radiation that is made up of a fast moving electron.
- 21. In beta decay, a ________ changes into a proton and an electron.
Down
- 1. Type of radiation that is made up of two protons and two neutrons.
- 2. The charge of an alpha particle
- 3. During alpha decay the _________ __________ of the element decreases by 2.
- 4. Type of radiation that is a high energy electromagnetic wave.
- 5. The part of the atom that contains protons and neutrons
- 6. The release of radiation by unstable nuclei is known as __________ ____________.
- 9. Nuclei that are ________ _______ are likely to release beta particles.
- 10. During beta decay, the atomic number increases by ______.
- 11. The time taken for half of the nuclei in a radioactive material to decay.
- 14. Gamma rays have a very ________ wavelength.
- 16. Nuclei that are _______ _________ are likely to release alpha particles.
- 19. An unstable nucleus will _________ (split up) during radiation.
- 20. The structure made from sub-atomic particles.