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there are only elements, not atoms
he just looked at the world -
He discovered all matter is made up of tiny, indivisible particles called atoms
the microscope was his method
Atom the indvisible particle, small & hard -
all matter is atoms, diff. masses & properties
he used chemicals as his method
rasin in the pudding, a solid lumpy sphere -
Discoverd electrons
he used the cathode rays to create the plum pudding model
plum -
discoverd of atom nucleus, plantary model of the atom, and the downfall of the plum pudding model
gold leaf experiment theory
tiny planetary system, with most of the mass in the neutron and electrons, orbiting like the sun -
2e- in first shell, 8e- in 2nd shell, 8e- in 3rd shell
calculating the diff. energy levels of the atom hrydrogen atom
showed that electrons couldn't have specific amounts of energy, leading them to move -
Schrödinger and Heisenberg discoverd quantum mechanics theory of quantum mechanics Each electron is a cloud, of negative charge, instead of one tiny negative particle
