History of Atomic Theory Project

Democritus

460

Democritus
Democritus was born in 460 BC and died in 370 BC. He was the first person to create the atomic theory. He discovered the atom, and said that atoms are inifite in number and combine with other atoms.

John Dalton

Sep 6, 1766

John Dalton
John Dalton was born on September 6, 1766 and died on July 26, 1844. His theory contribution stated that all matter comes from atoms, and that atoms and cannot be created nor destroyed.

J.J Thomson

Dec 18, 1856

jj thopmson
J.J Thomson was born on December 18, 1856 and died on August 30, 1940. His contrubution to the Atomic Theroy is that he was able to identfiy the extince of electrons in an atom.

Ernest Rutherford

Aug 3, 1871

RutherfordErnest Rutherford was born on August 3, 1871 and died on October 19, 1937. Ernest Rutherford's contrubution to science he was the first person to try the Gold Foil experiment.

Francis Aston

Sep 1, 1877

Francis
he was born on September 1, 1877 and died November 20, 1945. He was an honoary member of the Russian Academy of Science.

Niels Bohr

Oct 7, 1885

Niels Bohr
Neils Bohr was born on October 7, 1885 and he died on November 18, 1962. Bohr was one of the foremost scienctist of modern physics.

James Chadwick

Oct 20, 1891

Chadwick
James Chadwick was born on October 20, 1891 and died on July 24, 1974. He found that every element had an atomis mass and an atomis number.

Jmaes Chadwick

Oct 20, 1932

chadwickJames Chadwick was born October 20, 1932 and died July 24, 1974. Chadwick was the discoverer of the neutron, the neutral particle that, along with the proton, make up the nucleus of an atom.