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350
aristotle
he developed the theory that all matter consists of four elements earth,air,water, and fire. -
470
democritus
first proposed the exixtance of an ultimate particle -
Period: 470 to
chemistry project
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antione lauoisier
he proposed the combustian theory and named oxygen and hydrogen. -
joseph proust
made the law of definate proportions. -
john dalton
he stated that elements consisted of tiny particles called atoms. -
michael faraday
michael faraday developed the feild of theory of electromagnetism. -
robert millikan
he discovered the weight of an electron. -
henri baquerel
discovered that some chemicals spontaneosly decompose. -
jj thompson
discovered the negativly chaarged electrons in the bcathaid raid tube. -
marie curie
discovered that the strength of radiation did not depend on the compound. -
max planck
max planck devoloped the quantum theory -
albert einstien
he explained the special theory of relativity. -
ernest rutherford
described that the atom had a central positive nucleus surrounded by negative orbiting electrons -
neils bohr
made the legendary bohr model. -
james chadwick
chadwick joined rutherford to acomplishthe transmutation of light elements.