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?
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Iron has an atomic number of 26, while lead has an atomic number of 82. Since atomic number represents the number of protons in an atom, we can conclude that iron has a smaller atomic size than lead. Show more…
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