4.  An ancient Greek philosopher.  He was an influential pre- Socratic philosopher (pupil of Leucippus).  Formulated an atomic theory for the cosmos.  Believes there is a particle that is the simplest building block of matter, named "atomos" from the Greek word for "undivided."  All atomos must have size, shape and weight as well. http://edtech2.boisestate.edu/kilnerr/575/vftatom.html

5.  Father of modern chemistry-meticulous experimenter  The end of Phlogiston  Married Marie-Anne, who was not quite 14 at the time.  Madame Lavoisier learned English to translate the work of British chemists.  Guillotined!

6.  Joseph L. Proust (1754, France)  When Napoleon invaded Spain, they burned Proust's laboratory and forced him back to France.  Best known for Law of Definite Proportions. http://www.vzhang.com/vzfiles/joseph_proust.htm

7.  English chemist, meteorologist, and physicist  "Atomic Theory." Its tenets are as follows: 1. Elements are made of tiny particles called atoms. 2. All atoms of a given element are identical. 3. Atoms of a given element are different from those of any other element. Atoms of different elements can be distinguished from one another by their respective weights. 4. Atoms of one element can combine with atoms of another element in simple, whole number ratios to form compounds. 5. Atoms cannot be created, destroyed or subdivided.

8.  English chemist and physicist  Contributed to the fields of electromagnestism and electrochemistry.  As a chemist, Faraday discovered benzene, invented an early form of the Bunsen Burner and the system of oxidation numbers.

9.  English chemist and physicist  Worked on spectroscopy.  He was a pioneer of vacuum tubes, Crookes tube.

10.  English physicist. -Discovery of the electron and of isotopes, and the invention of the mass spectrometer. -Experiments with cathode rays

11.  German physicist, mathematician, astonomer, & philospher  Theory of General Relativity  Father of modern physics

12.  American physicist  Measurement of the charge on the electron- oil drop experiment  Worked on the photoelectric effect  First to earn a Ph.D. in physics from Colombia

13.  New-Zealand born English chemist and physicist  Father of nuclear physics  Discovered the concept of radioactive half-life  Gold-foil experiment, discovery of nucleus

14.  Danish physicist  Worked out a picture of atomic structure  Worked on the Manhattan Project

15.  English physicist  Discovered the neutron  Primary British scientist who collaborated in the Manhattan project