Model of the Atom Timeline
John Dalton 1803:
Dalton’s atomic theory came in 4 different parts.
1) All matter is made up of atoms. Atoms are indivisible and they are indestructible.
2) All atoms of an element are identical in mass and properties.
3) Compounds are created by a combination of two or more different kinds of atoms.
4) A chemical reaction is a “rearrangement” of atoms.
J.J. Thomson 1897:
Thomson proved that cathode rays were made up of previously unknown negative charged particles. In which he stated were much smaller than atoms.
Hantaro Nagaoka 1904:
He put forth an idea that there was a substitute planetary model of an atom in which a positively charged center is surrounded by revolving electrons.
Ernest Rutherford 1911:
He accredited that atoms have their charge concentrated in a small nucleus.
Niels Bohr 1913:
-Fun fact: Bohr was one of Rutherford's students.