-
400
Democritus
Democritus came up with the idea that all matter was made up of many smaller objects that he called atoms. However he had conducted no expierements and no physical proof. -
400
Democritus Atom Model
-
John Dalton
Dalton had agreed that all matter was mad of atoms that he stated where indestructable spheres. He also said that compounds are made up of two or more atoms. -
Daltons Atom Model
-
JJ Thomson
Thomson was the first scientist to discover the electron using an expieremental that used cathode ray tubes. His model is a bunch of electrons surrounded by a cloud of positive charges. -
JJ Thomsons Atom model
-
Robert Millikan
Millikan used an oil drop expierement to determine the charge of one single electron. -
Robert Millikan expierement
-
Ernst Rutherford
Rutherford discovered the nucleus and the protons of an atom using the gold foil expierement in whick lead him to discover the modern model of the atom. -
Ernst Rutherford atom model
-
Neils Bohr
Borh said that outer orbit atoms could have more electrons that in orbit ones. He said knowing this could help decide an atoms property. He also stated that electrons could jump. -
The Bohr atom model
-
James Chadwick
Chadwick discovered the nuetron. This let scientist understand more deeply how the atom works. -
Chadwicks atom model
