Topic: Radioactive Particles Do Now: Stable or Radioactive? 1. Th-234 2. U-238 3. Ca-40 4. Ra-226.

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Presentation transcript:

Topic: Radioactive Particles Do Now: Stable or Radioactive? 1. Th U Ca Ra-226

Transmutation-When an element turns into a different element by emitting a radioactive particle. This occurs when the number of protons changes.

Radioactivity – Rutherford again!

Penetration & Shielding Alpha particles have the least penetrating power Gamma waves have the greatest penetrating powwer

Turn to table 0 Add column for mass

2 Neutrons & 2 Protons Charge = +2 Mass = 4amu 4 2 He

Beta Particle – fast moving electron Charge = -1 Mass = 0amu

Gamma Wave Charge = 0 Mass = 0

Positron Positive beta particle Mass 0 Charge +1

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