Neils Bohr
Particle Theory is its name.
This particle was the electron in 1897 (J.J. Thomson).
This particle was the electron.
wave theory of light
subatomic particle
It was Max Planck who used the particle theory of light.
Pierre Gassendi (1592-1655), an atomist, proposed a particle theory of light.
it is the theory of how all particles are joined.
what is theory of matter ?
No b/c Thomson discovered that atoms can be cut. He found this out while studying rays traveling between charged metal plates in a vacuum tube. He discovered that the rays were consisted of negatively charged particles. He had just discovered electrons. He discovered all of this on a trip from America. Since electrons are so small, he believed that they could only be from inside of the atom. Since Thomson's discovery of the electron, John Dalton's theory that atoms are indivisible had to be changed.
Albert Einstein discovered the theory of relativity