9. have a mass number of 0. 10. Particles found in the nucleus are called .
11. is when electrons are released by a hot filament.
12. The number of protons and neutrons in an element is called the number.
13. was the first atomic bomb dropped.
14. would be an example of a spontaneous change to the nucleus.
15. decay results in the release of two protons and two neutrons.
16. are particles that would be attracted to a positively charged plate.
17. coined the word radioactivity.
18. is used to produced radioactive isotopes by
forcing nuclear reactions.
19. During , the nucleus of a Uranium 235 atom is split into lighter
elements, neutrons, and energy.
20. are the fastest form of radiation.
21. The number of protons in an element is called the number.
22. Irene Curie used as the source of alpha particles for her research.
23. Uranium goes through decay (a number) times to produce
Plutonium.
24. is a raw Uranium ore which was central to the discovery of radioactivity.
25. The was cited in the letter signed by Einstein as having ore with
high concentrations of U-235.