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John Dalton
John Dalton was born this day. He first proposes his Law Of Multiple Proportions. -
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Scientists Significant Events
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Amedeo Avogadro
Amedeo Avogadro is born. -
John Dalton 2
John Dalton propses his Atomic Theory. He states that all matter is made up of atoms, atoms in an element have the same mass and properties, compounds are formed by a combination of two or more atoms, and a chemical reaction is a reaarangement of atoms. He also found what a mole was and came up with a system of symbols for atoms and elements -
Amedeo Avogadro 2
Amedeo provides his hypothesis that at the same temperature and pressure, equal volumes of gases contain the same number of molecules or atoms. So when combined with the law of combining volumes by Gay-Lussac, formulas for hydrogen, oxygen and water come out to be H2, O2 and H2O. -
JJ Thompson
JJ Thompson is born. -
Robert Mililikin
Robert Millikin is born. -
Ernest Rutherford
Ernest Rutherford is born. -
JJ Thompson 2
JJ made a conclusion that electrons were components of all matter after observing a negative charged electron in a cathode ray tube. He then came up with the charge to mass ratio of an electron. Himself and others also discovered the proton. He also came up with the plum pudding model (shown in the picture). -
Robert Millikin 2
Robert uncovers the unit charge of the electron. He does this by performing his oil drop experiment in Chicago. This finding allows the calculation of the mass of an electron and positive charged atoms to happen. -
Ernest Rutherford 2
He proposes the nuclear atom in his gold foil experiment. This proposal said that the positive charge and the mass of the atom were a small volume at the center and most of the volume was empty space that was electrons. -
Ernest Rutherford 3
Proposes the third atomic particle, the neutron.
