Characteristics of an unstable nuclide?

Question

please give it in point form

Answer 1

It is radioactive.  

Depending on which unstable nuclide it is, it emits radiation in one or more of the following forms:

1. Alpha particles (high energy Helium-4 nuclei)

2. Beta particles (either high energy electrons or positrons)

3. Gamma rays (very high energy photons)

4. Neutrons (high energy neutrons)

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