1. | This subatomic particle has a negative charge. |
A. |
B. |
C. |
2. | The total number of these determines the mass number. |
A. |
B. |
C. |
3. | This particle has a mass that is about 1800 times smaller than the other two. |
A. |
B. |
C. |
4. | Isotopes of the same element have different numbers of these particles. |
A. |
B. |
C. |
5. | The number of these particles determines the atomic number |
A. |
B. |
C. |
D. |
E. |
6. | Found in the nucleus |
A. |
B. |
C. |
D. |
7. | Has a positive charge |
A. |
B. |
C. |
8. | Has no charge |
A. |
B. |
C. |
9. | Has a mass of about 1 amu |
A. |
B. |
C. |
D. |
E. |
F. |
10. | The number 14 is the: |
A. |
B. |
C. |
11. | The 28.09 is the: |
A. |
B. |
C. |
12. | You will need a periodic table for this one:A neutral atom of Pb-208 would have ? protons. |
A. |
B. |
C. |
13. | A neutral atom of Pb-208 would have ? neutrons. |
A. |
B. |
C. |
14. | A neutral atom of Pb-208 would have ? electrons. |
A. |
B. |
C. |
15. | Chlorine has two naturally occurring isotopes, Cl-35 with a relative abundance of 75.77% and Cl-37 with a relative abundance of 24.23%. On a piece of paper, work out the average atomic mass of chlorine rounded to the nearest 1/100th of an amu. Check out the explanation if you get it wrong! |
16. | Radium-211 has a half-life of 13 seconds. If you started with 600 mg of Ra-211, how many seconds would it take until you only had 18.75 mg? |
17. | The half-life of Radium-229 is 4 minutes. What was the original mass (to the nearest 1/100th of a gram) of Ra-229 if .32 g remains after 12 minutes? |
18. | Radium-226 has a half-life of 1600 years. What percentage would be left (to the nearest 1/100th of a percent) after 6400 years? Put a percent sign on your answer! |
19. | In beta decay, a neutron undergoes a change into a ? and then an electron is ejected from the nucleus. |
20. | In both fission and fusion, a small amount of ? is converted into energy. |
21. | In nuclear fusion, atoms of hydrogen are combined under intense heat and pressure to form ? |
22. | In nuclear fission, a ? strikes an atom of uranium (or plutonium) causing it to split. |
23. | Isotopes of the same element have the same mass number but different atomic numbers. |
A. |
B. |
24. | Over 99% of the mass of an atom is located within the tiny nucleus. |
A. |
B. |
25. | Most of an atom's volume is empty space. |
A. |
B. |
26. | The atomic number of an element is found by averaging the mass numbers of the isotopes and also takes into consideration the relative abundance of each isotope. |
A. |
B. |
27. | The nucleus of an atom has no charge, it is neutral. |
A. |
B. |
28. | In alpha decay, the nucleus ejects a particle that has two protons and two neutrons. |
A. |
B. |
29. | In alpha decay, the atomic number decreases by 4 and the mass number decreases by 2. |
A. |
B. |
30. | The radium nucleus here would be called: |
A. |
B. |
C. |
31. | The helium nucleus here would be called: |
A. |
B. |
C. |
32. | Which of the following is the best definition for half-life? |
A. |
B. |
C. |
D. |
33. | The very last symbol above represents: |
A. |
B. |
C. |
D. |
34. | How did the atomic number increase by one? |
A. |
B. |
C. |
D. |
35. | Which answer is closest to the half-life of the parent shown here? |
A. |
B. |
C. |
D. |
36. | This picture most closely shows: |
A. |
B. |
C. |
D. |
E. |
37. | The small white circles represent: |
A. |
B. |
C. |
D. |
E. |