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John Dalton
In 1803 he revealed the concept of "Dalton's Law of Partial Pressures" -
J.J Thomson
In, 1897 he knew the knowledge of atomic structure by his discovery of the electron -
Ernest Rutherford
In, 1911 he discovered the compact of the nuclei -
Robert Millikan
In, 1913 he discovered the measurement of a electron charge -
Neils Bohr
In, 1922 eh explained what happens inside a atom