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Chemistry Timeline

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by

Brandon Thompson

on 30 September 2013

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Transcript of Chemistry Timeline

Chemistry Timeline
By: William Schoneman
Democritus
460 BC
He is the guy that came
up with the atomic theory.
Antoine Lavoisier
1777
Invented the system
of chemical nomenclature
Law of Conservation of Mass
1789
States that the mass of an
isolated system will remain
constant over time
Law of Definite Proportions
1797
States that a chemical compound always contains exactly the same
proportion of elements by mass
John Dalton
1803
Developed the atomic theory upon which modern physical science use his theory that matter is composed of atoms of differing weights and combine in simple ratios by weight.
Dalton's Atomic Theory
1803

Positive nucleus and some negative
electrons have a
orbit around each other

Dmitri Mendeleev
1869
Joseph Thomson
1897
Thomson was the first
to discover the electron.
Cathode Ray
Tube Experiment
1897
Used the ray tube to
defect light and was
able to see
electrons
Marie Curie
1898
Arranged the periodic
table by atomic
weights
Plum Pudding
Atomic Model
1904
negatively charge electrons
were added to a positive
soup like plum pudding
Robert Millikan
1909
American experimental physicist know for his measurement of the charge on the electron and for photoelectric effect.
Gold Foil Experiment
1909
Gold foil experiment showed that there was a nucleus in the center of each atom
Ernest Rutherford
1910
Worked in nuclear physics and is know for his theory of the structure of the atom.
Rutherford Model
1911
Model replaced the plum pudding model of J.J. Thomson
Marcel Proust
1913-1927

Berthollet did not believe that
substances always combine in constant and definite proportions

Henry Moseley
1913

His law jump started the atomic physics
by providing the first
experimental
evidence in favour
of Bohr's theory
Niels Bohr
1913
Bohr Planetary model
1913
depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus
Erwin Schrodinger
1926
Quantum Mechical Model
1926
branch of physics dealing with physical phenomena at microscopic scales, where the action is
in the order of the plank constant
he wrote results for the quantum theory,
thus forming the basics
of the wave mechanics
Organized the
peroidic table
he made the planetery model
Full transcript