1. SPARK 1. Write the nuclear equations for the following:
Gold-185 decays by ejecting an alpha particle.
Uranium-233, alpha decay
Gd-149 decays by losing a helium nucleus.
Thorium-232 goes through alpha decay
Beta decay of gold-201
2. Polonium-210 has a half-life of 138 days. How much of the isotope is remaining after 176 days if the starting amount was 66 mg?
3. Compared to the atoms of nonmetals in Period 3, the atoms of metals in Period 3 have: fewer OR more valence electrons?
AGENDA
1) SPARK
2) SHARE OUT
3) LESSON
4) CLASS WORK
5) WRAP UP

2. Puzzler! Radioactive Emission Trends?
Isotope
Emission most likely to emit 3H
-1e
14C
150Pm 4
2He
225Fr
60Fe
270L
17O
What’s the pattern?
Where’s your evidence?
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3) LESSON
4) CLASS WORK
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3. DECAY TRENDS Elements whose atomic numbers are greater
than 83 have no known stable isotopes.
Elements with atomic numbers greater than 83 tend to undergo alpha decay, whereas elements with atomic numbers less than 83 tend to undergo beta decay.
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4. DECAY SERIES GRAPH More than one step to become stable nuclide =
map out transmutations! We can then look for patterns to understand the reactions easier.
AGENDA
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5. LET’S PRACTICE TOGETHER
Alpha decay of Thorium-232.
Beta decay of Radium-228.
Beta decay of the daughter nucleus of the previous question (#1b.)
AGENDA
1) SPARK
2) SHARE OUT
3) LESSON
4) CLASS WORK
5) WRAP UP