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400
Democritus and Aristotle
He came up with the word atom and stated the idea that all matter was composed of atoms. -
John Dalton
Used scinentific and explantion instead of pure reason. His main ideas of his theory were, elements are made of atoms. All atoms of one element are the same. Atoms are never the same in 2 elements. Atoms in two dofferent elements can be combined to make a Chemical compound
Atoms cant be divided into anything smaller, created or, destroyed in chemical changes -
Ernest Rutherford
He discovered that the atom was mostly empty space. His model was called the planetary model because it looked like the solar system. -
Niels Bohr
He made a model called the Bohr, that depicts the atom as a small postively charged nucleus that is surrounded by electrons. The electrons have a set orbit around the nucleus. -
James Chadwick
He discovered neutrons, and that the atomic mass is 2X bigger than a protons. -
Erwin Schrodinger
He said electrons are actually waves. He made the two slit experiment that said that light and matter can both be described as waves and particles.