Important Scientists

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Robert Boyle

1659 - 1662

He's known for for the "Boyle Law" which describes the relationship between the absolute pressure and volume of gas.

Antoine Lavoisier

1771 - 1772

His general great accomplishment in chemistry is known to be the fact that he changed the science from a qualitative to a quantitative one. Lavoisier is most noted for his discovery of the role oxygen plays in combustion. He recognized and named oxygen and hydrogen, and he also was the first to establish that sulfur was an element rather than a compound. Also discovered that although matter may change its form or shape, its mass will always stay the same

Joseph Piestley

1774 - 1779

Joseph is usually credited for discovering oxygen, having isolated it in gaseous states, although Carl Scheele and Antoine Lavoisier also claimed to discovered oxygen. Also invented soda water, his writing on electricity,and his discovery in many "airs" gases.

Carl Scheele

1774 - 1781

He discovered oxygen, and identified molybdenum, tungsten, barium, hydrogen, and chlorine. He also discovered organic acids tartaric, oxalic, uric, lactic, and citric, as well as hydrofluoric, hydrocyanic, and arsenic acids.

Joseph Proust

1794 - 1812

His largest accomplishments was disproving Berthollet with the law of definite proportions, which is sometimes also known as Proust's Law.

John Dalton

1807 - 1808

John Dalton is best known for his pioneering work in the development of modern atomic theory, and his research in colorblindness.

Julius Plucker

1859 - 1879

He made fundamental contributions to the field of analytical geometry and was a pioneer in the investigations of cathode rays that led eventually to the discovery of the electron.

J.J. Thompson

1891 - 1897

He estimated the mass of cathode rays by measuring the heat generated when the rays hit a thermal junction and comparing this with the magnetic deflection of the rays. His experiments suggested not only that cathode rays were over 1000 times lighter than the hydrogen atom, but also that their mass was the same in whichever type of atom they came from. He concluded that the rays were composed of very light, negatively charged particles which were a universal building block of atoms.

Jean Baptiste Perrin

1895 - 1905

Perrin showed that cathode rays were of negative electric charge nature. He computed Avogadro's number through several methods. He explained solar energy by the thermonuclear reactions of hydrogen

William Crookes

1895 - 1903

Crookes identified the first known sample of helium. Then he turned his attention to the newly discovered phenomenon of radioactivity.

Marie and Pierre Curie

1903 - 1911

Won a Noble Prize in 1903, which was shared with her husband Pierre, in Physics. Also in 1911 won the Noble Prize for Chemistry. Pierre and one of his students made the first discovery of nuclear energyHe also investigated the radiation emissions of radioactive substances, and through the use of magnetic fields was able to show that some of the emissions were positively charged, some were negative and some were neutral

Frederick Marsden

1913 - 1919

Soddy showed that an atom moves lower in atomic number by two places on alpha emission, higher by one place on beta emission.

Ernest Rutherford

1919 - 1932

Won a Noble Prize for discovering the neutron. He is known for being the father of nuclear physics.

James Chadwick

1928 - 1929

James discovered the neutron and went on to measure its mass.