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Democritus was a Greek Philosopher that proposed that small particles called atoms make up all matter. He is a very important figure in the science world today, without him, we wouldn't know what an atom is. Around 400 B.C.
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A British scienctist and school teacher reintroduces the concept of atoms with evidence to support his ideas. He was the savior of the "atom" theory.
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Identified electrons as particles that are present in every form of atom.
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A physicist from New Zealand discovers the positively charged nucleus of the atom. He played an important contribution to the theory by finding more information about what atoms look like.
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Niels Bohr proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities.
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