1. Unit 3 Review Game

2. Who theorized that everything was made of atoms and these atoms could be combined or rearranged in chemical reactions. Dalton

3. Who discovered atoms contained a small dense positive region? Rutherford

4. Which subatomic particles have the same mass? Protons and Neutrons

5. In neutral atoms, which subatomic particles are equal? Protons and electrons

6. What makes up the nucleus of the atom? Protons and neutrons

7. What keeps the protons in the nucleus together? The strong nuclear force

8. What is the force that says opposites attract? Electrostatic force

9. What is the difference between isotopes? # of neutrons

10. Nitrogen- 16 has how many protons, neutrons, and electrons Protons- 7, Neutrons-9, Electrons-7

11. What does the atomic # tell us? number of protons

12. What makes a carbon atom a carbon atom? The number of protons

13. What do you need to calculated the weighted average? Mass of isotopes and their % abundance

14. What is the top # in the following symbol? Mass # C 14 6

15. What is the bottom number in the following symbol? Atomic # O 20 8

16. What is the mass defect? mass of nucleus does not equal sum of parts

17. What formula is used to explain the mass defect? E=mc2

18. What is an alpha particle? He 4242

19. What is a beta particle? e 0

20. What stops each of the types of radioactive particles? alpha- paper, beta- wood/metal foil, gamma- lead/concrete

21. What is the half life? Amount of time for half of the radioactive isotopes to decay

22. What type of reaction creates a chain reaction? Fission

23. What type of reaction releases more energy? Nuclear or fusion

24. Know how to solve a half life problem and balance equations