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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