Across
- 1. where the protons and neutrons can be found in the atomic structure
- 3. particle in the nucleus with a positive charge
- 5. the number of counts from a sample per second
- 6. type of radiation involving a high speed electron
- 8. household appliance that uses radiation
- 9. to cause an atom to become charged by gain or loss of electron
- 11. most penetrating form of radiation
- 12. a nucleus of an atom that is likely to decay
- 16. electrons can be found in these orbiting the nucleus
- 17. the scientist responsible for the nuclear model of the atom
- 18. the most ionising type of radiation
- 19. the scientist responsible for the plum pudding model
Down
- 2. the exposure to a radioactive product by touching
- 4. the time for the number of unstable nuclei to reduce by 1/2
- 6. used to describe the radiation of the surroundings
- 7. atoms of the same element with a different number of neutrons
- 10. exposure to a radioactive material without touching
- 13. the unit activity is measured in
- 14. the charge of a neutron in the nucleus
- 15. sub-atomic particle with a negative charge