He worked worked with Rutherford to study the ways atoms reacted to light.
Electrons move around the nucleus in certain paths or energy levels.
Electrons can jump from path in one level to a path in another level.
Example: think of it as a ladder
He was a former student of Thomson.
He tested his theory with gold foil, and the particles mostly went straight through the foil, but some of them were deflected (turned to one side) and some even bounced straight back.
He discovered there was a nucleus inside an atom.
He showed a mistake in Dalton's theory.
He discovered there were small particles inside of a particle.
Discovered a Positively charged plate attracted a beam.
He said the beam was made out of particles with that have negative charges.
Rather than electrons being distributed within an electron configuration of shells and energy levels.So they were arranged by orbitals which were systematically distributed within Electron Clouds.
Defined it as: The region of space that surrounds a nucleus in which two electrons may randomly move.
He wanted to know why elements combined in certain proportions based on mass to create a compound.
He said:
"All substances are made of atoms." "Atoms are small particles they cannot be created, divided or destroyed."
"Atoms of the same element are exactly alike, and atoms of different elements are different."
Atoms join with other atoms to make new substances
440 B.C
He said that you could cut something in half and in half again and so on. until you were left with a particle that could not be cut anymore.
Aristotle- disagree with Democritus and he thought you would never be left with a particle that you could not cut
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