1. Complete the chart below.
Thorium*2
Zinc-67
Chemical Symbol
Atomic Number, Z
Mass Number, A
30
232
# of protons
#of neutrons
Group #
Period #
Which element has the smaller atomic size? (circle one)
Iron
Lead
2. You have a sample of Bismuth-212 to prepare for an upcoming medical test. This isotope has a half-life of 60 seconds. You prepare an 80 g sample 5.00 minutes prior to
the patient's arrival. How much Bismuth-212 remains when the patient arrives?
3. A sample of polonium-208 has a half-life of 2.898 years. What percent of polonium-208 remains after 6 half-lives?