Answer each question.
1. What are isotopes?
2. Name two isotopes of hydrogen.
3. What is radioactivity?
4. What is produced by nuclear decay?
5. What is the nuclear symbol for a neutron?
6. What is the nuclear symbol for a beta particle?
7. What is the nuclear symbol for an alpha particle?
8. What is the nuclear symbol for a positron?
9. What does the term half-life mean?
10. What is the nuclear symbol for a proton?
Solve each of the following problems as directed. Show all work.
11. The half-life of Carbon-14 is 5730 years. If a sample originally contained 3.36g of Carbon-14, how much is present after 22, 920 years?
12. Gold-191 has a half-life of 12.4 hours. After one day and 13.2 hours, 10.6g of Gold- 191 remains in a sample. How much Gold-191 was there originally?
13. There are 3.29g of iodine-126 remaining in a sample originally containing 26.3g of iodine-126. The half-life of iodine-126 is 13 days. How old is the sample?
14. A sample that originally contained 2.5g of rubidium-87 now contains 1.25q. The half-life of rubidium-87 is 6x10^10 years. How old is the sample? Is this possible? Why or why not?
Complete the following reactions.
15. 223- Ra --> _______ + alpha particle
16. 2- H + _______ --> 4-He
17. alpha particle + 14-N --> _______
18. 14-C --> _______ + beta particle
19. 87-Rb --> 87-Sr + ________