topic: radioactive particles do now: stable or radioactive? 1. th-234 2. u-238 3. ca-40 4. ra-226

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

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Topic: Radioactive Particles

Do Now: Stable or Radioactive?1. Th-2342. U-2383. Ca-404. Ra-226

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

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

Radioactivity – Rutherford again!

http://wps.prenhall.com/wps/media/objects/439/449969/Media_Portfolio/Chapter_05/FG05_09.JPG

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

Penetration & Shielding

Alpha particles have the least penetrating power

Gamma waves have the greatest penetrating powwer

Page 5: Topic: Radioactive Particles Do Now: Stable or Radioactive? 1. Th-234 2. U-238 3. Ca-40 4. Ra-226

Turn to table 0

• Add column for mass

Page 6: Topic: Radioactive Particles Do Now: Stable or Radioactive? 1. Th-234 2. U-238 3. Ca-40 4. Ra-226

2 Neutrons & 2 Protons

Charge = +2Mass = 4amu

42He

http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_17/FG17_04-01un.JPG

Page 7: Topic: Radioactive Particles Do Now: Stable or Radioactive? 1. Th-234 2. U-238 3. Ca-40 4. Ra-226

Beta Particle – fast moving electron

Charge = -1Mass = 0amu

http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_17/FG17_05-01f.JPG

Page 8: Topic: Radioactive Particles Do Now: Stable or Radioactive? 1. Th-234 2. U-238 3. Ca-40 4. Ra-226

Gamma Wave

Charge = 0Mass = 0

Page 9: Topic: Radioactive Particles Do Now: Stable or Radioactive? 1. Th-234 2. U-238 3. Ca-40 4. Ra-226

PositronPositive beta particle

Mass 0Charge +1

Page 10: Topic: Radioactive Particles Do Now: Stable or Radioactive? 1. Th-234 2. U-238 3. Ca-40 4. Ra-226

These subatomic particles that are emitted were discovered around 1900

• Alpha rays• Beta rays• Gamma rays

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