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Aristotle
He believed in the four elements of air, earth, water and fire. -
Joseph Priestly
He discovered oxygen which he called "dephlogisticated air". -
Antoine Lavoisier
He created the combustion theory which was based on sound mass measurements. -
Johann Becher
Developed the Phlogiston theory. -
Dalton
He discover that only certain gases canbe combined in certain proprotions. -
Dalton Atomic
Dalton gave oxygen an atomic weight of seven instead of eight. -
Dalton Model
In this year, he noted that oxygen and carbon combined together makes two compunds. -
Joseph Gay-Lussac
Joseph was the first to announced the law of combining volumes -
Amadeo Avogadro
He created the Avogadro's Hypothesis in which was not yet approved. -
Stanislao Cannizzaro
He was at a conference and wanted the Avogadro's Hypothesis be accepted. -
Dimitri Mendeleev
He creaed the periodic law and developed the first periodic table. -
Sir William Crookes
Discovered cathode rays travel in straight lines. -
J. J. Thomson
He identified the negative charged electron in the cathode ray tube -
Curies
They both are chemists-physicists. -
Curie's
They both discovered two other elements polonium and radium. -
Robert Millikan
He was the one the created the formula e = 1.60 x 10-19 coulombs -
Ernst Rutherford
He created the nuclear atom. -
Moseley
Found that the energy of the elements coming out from x-rays increased linearly. -
Henry Moseley
He was the one that said that there was a positive charge on the nucleus. -
Bohr
Niels Bohr created the Bohr Model of the Atom -
Bohr Atom
The bohr model is a planetary model. -
Francis Aston
He invented the mass spectrograph. -
James Chadwick
He discovered the neutron -
Democriotus Model
He was the person to use the word atom. -
Democritus Model
He also was the first one to tell everyone that atomics were mechanically bound.
