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Robert Boyle

1661 - 1668

In 1661, Boyle published the Skeptical Chymist (the scientific method). Because of Robert Boyle's new method of experimentation new elements were found, and Aristotle's ideas about matter were done away with.

Antoine Lavoisier

1771 - 1773

Recognizes and names oxygen, and notices its importance in its role in combustion. He also discovered the first modern system of chemical nomenclature. Creates the first concise definition of the law of conservation of mass and stoichiometry.

Carl Scheele

1774 - 1781

Helped in the discovered oxygen as well as organic acids. Carl isolated oxygen and called it "fire air".

Joseph Priestley

1774 - 1779

Discovered suphler dioxide and oxygen gas.

Joseph Proust

1798 - 1799

Disproved Berthollet with the law of definite proportions, the Proust's law.

John Dalton

1808 - 1809

He made his own atomic theory.
Dalton's Atomic Theory
1. All matter is composed of extremely small particles called atoms, which cannot be broken into smaller particles, created, or destroyed.
2. The atoms of any given element are all identical to each other and different from the atoms of other elements.
3. Atoms of different elements combine in specific ratios to form compounds.
4. In a chemical reaction, atoms are separated, rearranged, and recombined to form new compounds.

Julius Plucker

1859 - 1879

Julius plucker made contributions to the study of analytical geometry. He also helped in the investigation of cathode rays, this led to the discovery of the electron.

William Crookes

1875 - 1878

Worked on spectroscopy. He helped with vacuum tubes, and invented the Crookes tube and the Crookes radiometer.

Marie and Pierre Curie

1897 - 1901

Discovered radioactive isotopes.

J.J. Thomson

1897 - 1898

Modified Crookes tubes and realized that the tubes rays were negative.

Frederick Soddy

1898 - 1900

Discovered that radioactive elements decay creating alpha, beta, and gamma radiation.

Ernest Rutherford

1899 - 1901

Discovered the nucleus.

Jean Baptiste Perrin

1905 - 1926

Verified Albert Einstein's explanation of the Brownian motion phenomenon and therefore confirmed the atomic nature of matter.

Robert Millikan

1908 - 1909

Determined the mass and charge of a single electron

Ernest Marsden

1908 - 1909

Experimented with gold atoms, this was discovered under the direction of Rutherford.

Hans Geiger

1910 - 1911

Co-inventor of the Geiger counter.

James Chadwick

1928 - 1929

Discovered the neutron.