1. Not all isotopes are stable
Stable isotopes have…
1:1 ratio of n0 to p+
(for elements <20)
1.5:1 ratio of n0 to p+
(for elements >20)

2. Radioisotopes- unstable nucleus – they are radioactive
the nucleus of element emits subatomic particles and/or electromagnetic waves… by emitting these particles, nucleus changes into different element (it’s trying to become more stable)

3. Why is this a big deal?

4. These subatomic particles that are emitted were discovered around 1900
Alpha rays
Beta rays
Gamma rays

5. Radioactivity – Rutherford again!

6. Penetration & Shielding

7. Alpha Beta Gamma
Symbol
Sign
Charge
Penetrating
Power

8. Radioactivity