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Democritus proposed that all matter, including space and time was made up of small units named atoms. he made no experiments and had almost no evidence but his idea was kept on by Lucretuis.
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He proposed a mechanical universe that has small solid masses.
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John Dalton proposed an atomic theory involving solid atoms based on measurable properties of mass.
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He created the periodic table of elements according to their similarities. his Periodic law says that "Physical and Chemical of the elements are periodic functions of their atomic numbers."
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James proposed electric and magnetic fields were filled with the void.
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Found out that atoms have electrons
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Rutherford studied radiations emitted from uranium. Once discovered, he named them alpha and beta.
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He published the famous formula/equation; E=mc 2
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Using alpha particles as atomic bullets, he established that the nucleus was: very dense,very small and positively charged. He also assumed that the electrons were located outside the nucleus.
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he discovered the neutron. the neutron is what balances the protons in the nucleus on an atom