Chem Review

1. atomic number + number of neutrons
4. type of radiation that has no mass and is pure energy
6. atoms will undergo this decay until they form stable atoms
11. particles and rays emitted by radioactive materials
13. Believed that atoms could not be created, destroyed, or further divided
14. negatively charged particle
15. type of reaction that can change an element into a new element by a change in an atom’s nucleus.
16. atom of one element with differing number of neutrons
18. place in Pennsylvania that had a nuclear emergency
19. reactor in russia that had a meltdown

2. represents the number of protons in an atom
3. type of radiation attracted to a positive plate
5. type of radiation attracted to a negative plate
7. Rejected the notion of atoms, because it did not agree with his own ideas about nature
8. Studied many chemical reactions and was able to determine mass ratios for each element
9. How unstable nuclei lose energy
10. number of parts to Daltons atomic theory
11. when substances emit radiation
12. area of the atom that contains protons and neutrons
17. positively charged particle