2. What has a charge of +1?

3. Which scientist developed the plum pudding model of the atom?

4. What is the atomic mass of carbon?

5. What is the number of neutrons in Bromine-80?

6. What element has 14 protons?

7. What is the mass number of the atom shown?

8. How many neutrons are in an atom of chlorine?

9. Which one is comprised of the other three?
a. proton b. atom
c. electron d. neutron

10. Rutherford expected alpha particle to travel almost straight through a target of gold foil. The results of his gold foil experiment did not support
a. Millikan’s oil drop experiment
b. Thomson’s plum pudding theory
c. the cathode ray phenomenon
d. Bohr’s atomic model

11. What does it mean when two atoms are isotopes of one another?

12. An atom has 23 protons and 29 neutrons
An atom has 23 protons and 29 neutrons. What is the correct chemical symbol for this atom?

13. An industrially important element contains 26 electrons and rusts in the presence of air and moisture. Identify
the element.

14. What element has 10 protons?

15. Magnesium has three isotopes
Magnesium has three isotopes. Magnesium-24 has a percent abundance of 78.99%. Magnesium-26 has a percent abundance of 11.01%. What is the percent abundance of magnesium-25?

16. Calculate the atomic mass of iridium. Iridium has two isotopes
Calculate the atomic mass of iridium. Iridium has two isotopes. Iridium-191 has a mass of amu and a percent abundance of 37.58%. Iridium-193 has a mass of amu and a percent abundance of 62.42%.

17. How many more neutrons does thorium-230 have than protons
How many more neutrons does thorium-230 have than protons? How many electrons does thorium-230 have?

18. How many protons, electrons, and neutrons are in U-235?

19. How many protons, electrons, and neutrons are in H-3?

20. How many protons, electrons, and neutrons are in silicon-29?

21. Use the table below to calculate the atomic mass of element X
Use the table below to calculate the atomic mass of element X. Then use the periodic table to identify the element.