Across
- 2. Atoms with the same number of protons but different numbers of neutrons
- 3. A helium nucleus thrown out by some radioactive substances
- 5. A series of events so related to each other that each one initiates the next
- 7. The emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei
- 10. the total number of protons and neutrons in a nucleus
- 12. A nuclear reaction where a nucleus splits spontaneously or on impact with another particle
- 13. The process by which two atomic nuclei combine to form a single heavier one
- 14. The time taken for something to halve its quantity
Down
- 1. A charged particle that is emitted from the nucleus of a radioactive element
- 4. A subatomic particle of about the same mass as a proton.
- 6. Electromagnetic radiation that is thown out by an unstable nucleus of an atom during decay
- 8. Equal to the number of protons in the nucleus of an atom or the number of electrons
- 9. A stable subatomic particle occurring in all atomic nuclei with a positive electric charge
- 11. Positively charged, center of an atom