Use the following people and terms to answer the following questions. People and terms may be used more than once or not at all!

Chadwick	Rutherford	Dalton	Democritus	Thomson
Millikan	cathode ray tube	proton	neutron	electron
atom	bromine	mercury	fluorine	helium

1. Confirmed the existence of the neutron	____________________
2. Largest of the sub-atomic particles	____________________
3. Device in which electrons travel as rays from negative to positive pole.	____________________
4. Suggested existence of atom in the 4th century B. C.	____________________
5. Studied ratios in which elements combine in chemical reactions. He used his results to formulate an atomic theory.	____________________
6. Discovered electrons in 1897	____________________
7. Proposed that a cathode ray is a stream of negatively charged particles moving at high speed.	____________________
8. The mass of this particle is about1/2000 than of a hydrogen atom	____________________
9. This substance is a red liquid at room temperature	____________________
10. Discovered the nucleus of the atom	____________________
11. This substance is a silver liquid at room temperature	____________________
12. Determined the quantity of charge carried by an electron	____________________
13. Stated, without experimental evidence, that the atom is indestructible and indivisible	____________________
14. This is the name of a negatively charged subatomic particle	____________________
15. This substance is a noble gas	____________________