Radioactivity

3. particles of two protons and two neutrons emitted by unstable nuclei
4. the process of creating a charged atom as a result of bombardment by high energy radiation.
6. the average time taken for the number of nuclei of an isotope to halve.
9. the number of protons and neutrons in an element
10. alpha and beta can be deflected in a magnetic field and what other type of field
11. high energy electrons emitted from unstable nuclei

1. the state of a nucleus that sheds alpha beta or gamma radiation.
2. alpha is normally stopped by this material
3. the number used to identify how many protons in an element.
5. the process of an unstable nucleus becoming a stable nucleus by emitting radiation.
7. the name of an atom that possesses the same number of protons but a different number of neutrons.
8. high frequency electromagnetic radiation emitted from unstable nuclei