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TRANSCRIPT
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Radioactivity
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Chemistry Joke
Q: What do you get when you put Jim Carrey in jail?
A: Si
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•The presence of too many or too few neutrons relative to protons can cause a nucleus to be unstable.
•An unstable nucleus will change to become stable.
•This process of radioactivity releases a lot of energy
•Also called radioactive decay
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•Radioactivity produces both penetrating rays and particles.
•The particles and rays are called radiation.
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–Alpha
–Beta
–Gamma
3 Types of Radiation
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Alpha Radiation
•Helium nuclei that have been emitted from a radioactive source.
•These emitted particles are called alpha particles.
• Contain two protons and two neutrons—very heavy
•Have a double positive charge. ++
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Nuclear Radiation > Types of Radiation
Equation:
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Beta Radiation
An electron resulting from the breaking apart of a neutron in an atom is called a beta particle.
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Nuclear Radiation >
Equation:
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Gamma Radiation
•A high-energy photon emitted by a radioisotope is called a gamma ray.
•Often emitted with either alpha or beta particles.
•Has no mass or charge
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•Alpha particles are the least penetrating.
•Gamma rays are the most penetrating.
Penetrating Power
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Section Quiz.
1. An unstable nucleus releases energy by
a. emitting radiation.
b. thermal vibrations.
c. a chemical reaction.
d. giving off heat.
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Section Quiz.
2. Which property does NOT describe an alpha particle?
a. 2+ charge
b. a relatively large mass
c. a negative charge
d. low penetrating power
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Section Quiz.
3. When a radioactive nucleus releases a high-speed electron, the process can be described as
a. oxidation.
b. alpha emission.
c. beta emission.
d. gamma radiation.
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Half-Life Section
A half-life (t1/2) is the time required for one-half of a radioisotope sample to decay to products.
After each half-life, half of the existing radioactive atoms have decayed into atoms of a new element.
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Half-Life
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Half-Life
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Slide 20 of 21
10.4 h ÷ 2.6 h = 4 half lives
1.0 mg x 0.5 x 0.5 x 0.5 x 0.5 = 0.063 mg
Or…1.0 mg x (0.5)4 = 0.063 mg
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Slide 21 of 21
If there were 128 grams of radioactive material initially, what mass remains after four half-lives?
8 grams
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Slide 22 of 21
Chemistry Joke
Q: If the formula for water is H20, what’s the formula for ice?
A: H203