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J.J. Berzelius
Credited for creating modern symbols for elements
Democritus
Greek philosopher who coined ‘atomos’, thought that matter was made of indivisible particles
John Dalton
Created third law of atomic theory: that when two elements can form multiple compounds, the ratio of masses remain constant for each compound
J.J. Thomson
Discovered that atoms are made of particles, experimented with the cathode ray tube, proved that atoms are not indivisible, thought atoms were like plum pudding
Robert Millikan
determined the charge of the electron with his oil drop experiment
Ernest Rutherford
used alpha particles to discover the positive nucleus, performed the gold foil experiment, proposed planetary model
Neils Bohr
proposed the Bohr model, where electrons uncertainly orbit the positively charged nucleus
Willard Libby
Developed the process of radiocarbon dating
Proust
Created law of definite proportions
