History of the Atom

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History of the Atom

1905- Einstein used Planck's theory to describe the particle propety of light

The History of an Atom

1897- Thompson carried out the experiment with a cathode ray tube

1826- Dalton was awarded the Society's Royal Medal for his Atomic Theory

400 B.C.- Democritus believed that atoms existed in different shapes and motions which created everything that one sees in the universe.

400 B.C.- Greek atomic model was propsed by Democritus.

1803- Dalton made his first table of atomic weights

1897- Thompson discovered the electron - first subatomic particle

1900- Planck formed a qunatum theory

1789- Lavoiser formed The Law of Conservation of Mass

1907- Rutherford carried out the Geiger Marsden experiment, an attempt to examine the structure of an atom

1905- Einstein created the quantum theory of light

1908- Rutherford was awarded Nobel Prize in Chemistry for his theory of atomic structure

1913- Millikan did the oil-drop experiment to measure the charge of an electron

1924- de Broglie developed his thoery of electron waves

1927- Heinsenberg proposed the uncertianty relation giving limits to the percision with which the position and velocity of a particle can be simultaneously determined

1935- Bohr created the picture of the atom as most people know today

1911- Curie won the Nobel Prize in Chemistry for the discovery of radioactive elements polonium and radium

1915- Einstein complete the theory of relativity

1926- Schrodinger used mathematical equations to describe the likelihood of finding an electron in a certian position, also known as the quantum mechanical model.

1932- Chadwick had proof of the existance of the neutron


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