How many times can one cut a piece of gold in half? A Greek
philosopher named Democritus was the first in a long line of scientists and
mathematicians to try to answer this very difficult question. Around 450
BC, Democritus stated that all mater was composed of particles that he
called atomos (where the English word atom comes from) and that these
particles could not be cut. This went against the present day theory of
Aristotle which was that matter could be cut infinitely. Unfortunately for
Democritus, his theory was not accepted in his lifetime.
John Dalton came up with an atomic theory of matter in 1803. In
his theory he stated four theories. 1.)All mater is composed of atoms ...

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tube, magnets and charged plates, he sent ray particles through
various experiments changing the position of the charged plates. By
changing the plates, he discovered he could also change the point at which
the particles would hit a florescent screen at the end of the tube. He
decided that the ray was made up of particles with a negative charge. He
named these particles electrons. This discovery also showed that atoms had
a substructure. Thomson made a model showing his idea for the atom. His
model, called the raisin dough model had positive and negative particles
imbedded into a positive atom.
Other particles in the atoms nucleus were discovered after the
electron thanks to Albert Einstein. In his theory of relativity, proposed
in 1905, Einstein developed the equation E=mc2, with E representing energy,
m representing mass and c representing the velocity of light. This meant
that because the nucleus made up such a large percentage of a atoms mass,
the atoms energy came from ...

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Atoms. (2007, April 8). Retrieved January 22, 2019, from
"Atoms.", 8 Apr. 2007. Web. 22 Jan. 2019. <>
"Atoms." April 8, 2007. Accessed January 22, 2019.
"Atoms." April 8, 2007. Accessed January 22, 2019.
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Added: 4/8/2007 11:01:31 AM
Category: Science & Nature
Type: Premium Paper
Words: 520
Pages: 2

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