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1. The discovery of the electron is credited to

2. Canal rays were discovered by

3. The charge on a proton is

4. The mass of a proton is approximately how many times that of an electron?

5. The mass of an electron is considered

6. The first model of the atom was proposed by

7. Thomson’s model compares the atom to a

8. In Thomson’s model, atoms are electrically neutral because

9. The alpha particle scattering experiment was done by

10. The gold foil in Rutherford’s experiment was about how many atoms thick?

11. Alpha particles are

12. In Rutherford’s experiment, most alpha particles passed straight through because

13. Very few α-particles were deflected because

14. Rutherford concluded that the nucleus is

15. The radius of the nucleus is about how many times smaller than that of the atom?

16. The electrons revolve around the nucleus in

17. The major drawback of Rutherford’s model was

18. Bohr’s model of the atom was proposed to

19. In Bohr’s model, electrons revolve in

20. According to Bohr, electrons in discrete orbits