Atomic History
Category: Other
Updated: 29 Oct 2018
Contributors
Created byFelipe Martinez
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Events
Sinking of the Titanic
1911Colmbus' First Voyage
1492World War I
1914My Birth
2003Revolutionary War
1775My Parents' Birth
1970 & 1976World War II
1939American Civil War
1861~~~~~~~Democritus~~~~~~~
400 BCE
Theorized that all matter is
composed of small, invisible
particles.~~~~~~~~~Aristotle~~~~~~~~~
334 BCE
Thought that all matter was
made up of a combination of
earth, air, water, and fire.~~~~~Lavoisier~~~~~
1774
Proposed the Law of
Conservation of Mass~~~~~~~~~~~~~John Dalton~~~~~~~~~~~~~
1811
Proposed the Law of Multiple Porportions
and the first Atomic Theory:
All matter is made up of tiny indivisible
atoms. Atoms of the same element
are the same, of different elements
are different, combine in whole number
ratios to form compounds.~~~~~~~~~~Berzelius~~~~~~~~~~
1830
Simplified Dalton's symbols of
elements
Near-accurately calculated the
atomic masses of 54 elements~~~~~~~~~~Avogadro~~~~~~~~~~
1811
Proposed Avogado's Hypothesis;
equal volumes of gases, under the
same conditions, will have the
same amount of particles.~~~~~~~~~J.J. Thompson~~~~~~~~~
1897
Used cathode ray tubes to discover
the mass-to-charge ratio of the
electron and the proton.
Creator of 'Plum Pudding Model'~~~~~~~~~~Curie, M~~~~~~~~~~
1898
Coined the term 'radioactivity' to describe some elements' rapid decay~~~~~~~~~~Rutherford~~~~~~~~~~
1911
Conducted a 'gold foil experiment'
to discover that the nucleus is small
& heavy, and that electrons orbit the
nucleus in a mostly empty space.~~~~~~~~Mosely~~~~~~~~
1914
Determined the charge
of the nuclei of most atoms~~~~~~Chadwick~~~~~~
1932
Discovered the neutron~~~~~~Millikan~~~~~~
1909
Determined the
charge of an electron~~~~~~~~~~Bohr~~~~~~~~~~
1922
His model displayed
electrons in a series of shells~~~~~~~~~Planck~~~~~~~~~
1900
Introduced the concept of quanta to explain glowing hot matter~~~~~~~Schrodinger~~~~~~~
1930
His model describes electrons
as a cloud, because you can't
determine the location of a
specific electron easily~~~~~~~~~~~~Heisenberg~~~~~~~~~~~~
1927
Proposed the Principle of Indeterminacy;
you can't know both the position and
velocity of a particle
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