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Democritus was the first to suggest that all matter consisted of small indivisible particles
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John Dalton was the first to state that all matter is made of atoms and they are indivisible and indestructible.
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Max Planck first discovered quantum theory which is a theory of matter and energy based on the concept of quantum
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Dmitri Mendeleev is the man who discovered and made the periodic table
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Eugene Goldstein discovered protons He discovered protons with the experiments he did with cathode rays which would knock electrons of atoms and attract them to a positively charged electrode.
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J.J. Thomson discovered the electron by experimenting with a Crookes. The model that he drew was known as the plum pudding model
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Ernest Rutherford was the person to first discover the nucleus by doing the "scatter" experiment
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Niels Bohr was the first to suggest that electrons have separate orbit routes around the nucleus and that the number of electrons around it determined the properties of the elements
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Robert Millikan did the "oil drop" experiment He determined that there was a smallest 'unit' charge, or that charge is quantized
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Werner Heisenberg created the theory of quantum mechanics. THis resulted in the discovery of allotropic forms of hydrogen
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Erwin Schrodinger used mathematical equations to describe the likelihood of finding an electron in a certain position. This became known as quantum mechanical model of the atom
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James Chadwick discovered the neutron, it was a uncharged but massive particle. It could be used to probe other nuclei.
