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400
Democritus Model
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460
Democritus
(B.C) "Nothing can change into somebthing absolutely different" He first came up with the word "atom" and that they had masses. No atom could be identical and all of them had different shapes and sizes. -
476
Fall of the Roman Empire
(B.C) Roman Empire Fell -
Isaac Newton
Proposed a mechanical universe with small solid masses in motion. -
North Carolina
North Carolina seperates from South Carolina and gains its own Govenor -
John Dalton
discovered the law of partial pressures, and the law of stoichiometry. he had the first opinion that atoms of different elements had different masses, which then liad the foundation of the modern study of atoms. -
Lavoisier
He provided the formula for the conservation of matter in chemical reactions, and also distinguished between an element and a compound. -
Joseph Proust
Proust proposed the law of constant composition, which states that a compound always has the same element in the proportion by mass. -
Washington D.C
D.C. becomes U.S capital -
J.J Thompson
He was the Father of electrons and discovered isotopes as well but also invented the Mass Spectrometer. -
Railroad
Continental Railroad was finished in Utah -
W.K. Roentgen
He discovered x-rays while experimenting with cathode-ray tubes. -
Henri Becquerel
He was one of the first scientists to describe radiation with x-rays and uranium and than while studying the effect of x-rays on photographic Film he discovered some chemicals spontaneously decomposing and giveing off very pentrating rays. -
Thomson's Plum Pudding
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Max Planck
Known as one of the Founders of the Quantum Theory and developed it into a universal constant (known as Planck's Constant) where E=f*h and where h= 6.63*10E-34 Js. -
Erwin Schrödinger
He is the father of Quantum Mechanics but also can up with the Schrodinger eqation for Phisics. -
Robert Millikan
He determined the atomic stru cture of electricity by accurately determining that electrons were negatively charged and that the charge was consistant for all electrons. -
Ernest Rutherford
Rutherford discovered a central positive nucleus that was surrounded by negatively charged electrons that were orbiting the nucleus. His model suggested that most5 of the mass was contained in the nucleus and the rest of the area surrounding it was mostyly empty space. -
Rutherford model
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We have rights too!
Women were given the right to vote in the U.S -
Louis de Brogile
Brogile showed that every object is associated with a wave and he found that small electrons where easiestly observably associated with waves. -
Werner Heisenberg
Made major contributions to Quantun Mechanics and asserted the uncertainty principle of Quantum Theory. -
James Chadwick
Proved the Atomic nucleus contained a neutral particle, discovering the neutron, -
Glenn Seaborg
Synthesized 6 transuranium elements and suggested a change in the layout of the periodic table -
"I have a Dream"
Martin Luther King made his speech "I have a Dream" -
Bohr Model
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Niels Bohr
Bohr model of the atom, theory that electrons travel in orbits around the nucleus of an atom. -
Quantum Mechanical Model
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Aristotle
(B.C) Considered that there where four basic characteristics to a substance: Wettness, dryness, heat, and cold. He stated that the world couldn't be made of invisible particles becuase gravity would pull them down.
