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450
Aristotle
He stated that atoms did not exist, leading most to belive him in his statements. "Chemistry Project : The History Of The Atom." Chemistry Project : The History Of The Atom. N.p., n.d. Web. 26 Feb. 2014. -
450
The "Founder" of the Atom.
In 460 B.C, Democritus posed the question: "If you break a piece of matter in half, and then break it in half again, how many breaks will you have to make before you can break it no further?" Democritus figured that this particle would be the smallest size achievable. He called this 'the atom.' "Chemistry Project : The History Of The Atom." Chemistry Project : The History Of The Atom. N.p., n.d. Web. 26 Feb. 2014. -
Newton's Theory
Sir Isaac Newton proposes a mechanical universe with small solid masses in motion. "Chemistry Project : The History Of The Atom." Chemistry Project : The History Of The Atom. N.p., n.d. Web. 26 Feb. 2014. -
Dalton's Experiments
In the 1800's, John Dalton performed experiments that proved that atoms consisted of elementary lumpy particles (aka atoms.)
These atoms were solid balls that could not be broken down any further. "Chemistry Project : The History Of The Atom." Chemistry Project : The History Of The Atom. N.p., n.d. Web. 26 Feb. 2014. -
"Raisin in the Pudding"
Thomson proposed a 'Plum Pudding' model in which negative electrons floated on the outside of a positively charged ball of matter. To do this he conducted experiments with cathodes in which he set up two metal plates and charged them with electricity. When this happened, the plates put out a cathode ray. He then applied magnets to determine the charge of the particles. "Chemistry Project : The History Of The Atom." Chemistry Project : The History Of The Atom. N.p., n.d. Web. 26 Feb. 2014. -
Planck's Ideas
Scientist Max Planck showed that when you vibrate atoms strong enough, you can measure the energy in discrete units, which he called 'quanta.' "Chemistry Project : The History Of The Atom." Chemistry Project : The History Of The Atom. N.p., n.d. Web. 26 Feb. 2014. -
Rutherford's Nucleus Atom
Rutherford discovered the nucleus, a positively charged center of the atom by conducting experiments with gold foil in which he launched alpha particles at foil. "Chemistry Project : The History Of The Atom." Chemistry Project : The History Of The Atom. N.p., n.d. Web. 26 Feb. 2014. -
Bohr's Atomic Model
Bohr stated in 1913 that electrons orbit the nucleus and can only move in one direction. "Chemistry Project : The History Of The Atom." Chemistry Project : The History Of The Atom. N.p., n.d. Web. 26 Feb. 2014. -
Heisenberg and Schrodinger
The Shroedinger equation is one tat describes the form of the probability waves that govern the motion of small particles an dhow hese waves are altered by external influences. He did this by studying mathematical models.
