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370 BCE
Democritus
According to Democritus’ atomic theory,everything is composed of atoms, between atoms is empty, and atoms are indestructible -
Antoine Lavoisier
He proposed the Combustion Theory which was based on sound mass measurements. He named oxygen. He also proposed the Law of Conversation of Mass which represents the beginning of modern chemistry. -
Michael Faraday
He made one of the most significant discoveries that led to the idea that atoms had an electrical component. -
John Dalton
He developed the developed the concept of the mole and proposed a system of symbols to represent atoms of different elements. -
Joseph Proust
He proposed the the Law of Constant Composition in 1799 -
Marie & Pierre Curie
They contributed to the study radium and radiation -
J.J. Thomson
He discovered the electron by experimenting with a Crookes -
Ernest Rutherford
He postulated the nuclear structure of the atom -
Neils Bohr
He proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities -
Robert Millikan
He discovering the value for electron charge, e, through the famous oil drop experiment -
Erwin Schrodinger
He used mathematical equations to describe the likelihood of finding an electron in a certain position. -
James Chadwick
He discovered the neutron in atoms