Radioactivity Crossword

1. The structure made from sub-atomic particles.
4. An unstable nucleus will _________ (split up) during radiation.
6. Type of radiation that is a high energy electromagnetic wave.
8. Nuclei that are ________ _______ are likely to release beta particles.
11. Materials that are radioactive have nuclei that are ____________.
12. Gamma rays have a very ________ frequency.
13. During beta decay, the atomic number increases by ______.
15. The charge of an alpha particle
16. Gamma rays have a very ________ wavelength.
17. Type of radiation that is made up of a fast moving electron.
18. Piece of equipment used to measure radiation.
19. Emitting gamma rays causes a nucleus to ________ it's energy state.
20. The part of the atom that contains protons and neutrons
21. Nuclei that are _______ _________ are likely to release alpha particles.

2. During alpha decay, the __________ __________ of the element decreases by 4.
3. Term used to describe materials that give out nuclear radiation
5. During alpha decay the _________ __________ of the element decreases by 2.
7. Type of radiation that is made up of two protons and two neutrons.
9. The time taken for half of the nuclei in a radioactive material to decay.
10. The release of radiation by unstable nuclei is known as __________ ____________.
14. In beta decay, a ________ changes into a proton and an electron.