New timeline
Category: Other
Updated: 18 Dec 2017
Contributors
Created bycarli rojas
Attachments
Periods
Democritus: A greek Philosopher who was the
first person to have the idea that matter is
made up of tiny individual particles called
atoms. He was born in Abdera, Thrace.Dalton: He was born in Eaglesfield, Cumbria,
United Kingdom. He came up with the hard
sphere model or in other word the cannonball
model. His model had no internal structure,Ernest Rutherford: He lived in Brightwater, New
Zealand. The empty space model was created
by him. The experiment he performed was
called the gold foil experiment. In this
experiment he used Radium as the source of
the alpha particles. He shot at a thin gold foil
which was like aluminum but made out of gold.
He observed the impact of the alpha particles.
With this experiment he found out that the
nucleus is a small dense and positive and the
electrons revolve around the nucleus.J. J. Thomson: He lived in Cheetham Hill,
Manchester, United Kingdom. He came up with
the plum pudding model. The experiment he did
for this was the Cathode Ray Experiment. In this
experiment A tube with a medal was setup to
trace a beam from an electrical source. If an
anode happened the medal disk was positive if
it was a cathode a medal disk was negative. The
beam deflected and attracted the positive plate
and it repelled a negative plate. This experiment
showed that electrons and protons dispMillikan: He lived in Morrison, IL. Millikan did a
experiment that oil droplets was sprayed to the
chamber. Some of the oil droplets fell through a
pinhole between the two plates of the electrical
field. Millikan used a microscope to observe .
Droplets captured some electrons and droplets
caught no electrons. This concluded that the
mass of an electron is 1000 times smaller than
the lightest atom.Chadwick: He lived in Bollington, United
Kingdom. The design of this experiment was
that a sample of Be was bombard with alpha
particles. This caused a radiation which he
though the radiation was neutral because it
defelcted by electrical fields.He came witha
conclusion that neutrons and protons have the
same mass. Also that protons and neutrons are
locate in the nucleus. This made the atoms have
a higher elements.Einstein: He lived in Ulm, Germany. He talked
about the electromagnetic radiation. He thought
it was made up of Photons.Bohr: He lived in Copenhagen, Denmark. His
model showed how electrons orbit the nucleus
in orbits that represent specific quantities of
energyDe Broglie: He lived in Dieppe, France. He made
an equation which was wavelength= h/p. This
means that electrons behave like aves on a
vibrating string than like particles.Schrodinger: He lived in Vienna, Austria. He
developed the equation of quantum mechanics.
His model shows how an electron can be found
in a given region of space at a given time.Heisenberg: He lived in Wurzburg, Germany. he
found out that it is impossible to know the
position and the velocity of an electron at the
same time. This was known as the uncertain
principle.
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