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Empedocles had an idea that atoms were made out of either 4 elements which were earth, air, fire and water. -
Democritus had a believe that atoms were made of tiny little particles, and what were inside of these particles affected the type of matter these particles were. -
John Dalton had a proposal that stated, that every single atom in one single element is the same atom. -
J.J Thomson conducted expirements in his lab which proved that atoms do indeed have a negative charge. -
Ernest Rutherford found that an atom is mainly just an empty space but inside of the nucleus of the atom is where it holds the most of it's mass. -
Niels Bohr made the Bohr atom model and in this model of the atom, in which he proposed that electrons orbited around the atom nucleus -
Louis DeBroglie was the first person to suggest the idea that these particles that we call atoms today have electrons inside of them, and he also suggested to not only describe this as a particle but as waves. -
Erwin Schrödinger was the first person the calculate the first wave equation of energy levels inside of electrons. -
Werner Heinsberg discovered that a particles momentum or state cannot be known precisley and he found this out using Quantum Mechanics -
James Chadwick is mostly known for his discovery of the neutron which he stated that it is a particle that does not have an electric charge in it.