-
400 BCE
Democritus
Democritus put fourth the idea that atoms existed. He thought that atoms were invisible and were indestructible -
John Dalton Solid Sphere Model
John Dalton discovered that an atom is a sphere. He thought that they were invisible and that all the atoms of an element are identical. -
JJ Thompson Plum Pudding Model
Thompson discovered electrons. He made the Plum Pudding Model that shows the electrons skattered throughout the spherical cloud of positive charge -
Ernest Rutherford Nuclear Model
Rutherford fired positivly charged particles at a thin sheet of gold foil. Most of the particles made it through the foil but some didnt. This showed that the atoms are mostly empty space, with a small positive charge at the center: Nucleous. -
Neils Bohr
Bohr stated that the electrons moved around the nucleus in orbits of fixed sizes and energies. -
Erwin Schrodinger
Schrodinger discovered that the electron do not move in a set path for it is impossible to know the exact movment of the electrons, but there are clouds of probability called orbitals where you have a better probobility of finding electrons.
