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490 BCE
Democritus Born
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470 BCE
Democritus and decay
Democritus first explained decay ,the theory meant that matter could never be destroyed but change shape in the world -
465 BCE
Atom Theory of Democritus
1.All matter consists of invisible particles called atoms.
2. Atoms are indestructible.
3. Atoms are solid but invisible.
4. Atoms are homogenous.
5. Atoms differ in size, shape, mass, position, and arrangement.
->Solids are made of small, pointy atoms.
->Liquids are made of large, round atoms.
->Oils are made of very fine, small atoms that can easily slip past each other. -
370
Democritus Died
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Period: 400 to Jan 1, 1400
Medival Alchemy
Alchemy in the Middle Ages was a mixture of science, philosophy and mysticism. Far from operating within the modern definition of a scientific discipline, medieval alchemists approached their craft with a holistic attitude; they believed that purity of mind, body and spirit was necessary to pursue the alchemical quest successfully. At the heart of medieval alchemy was the idea that all matter was composed of four elements: earth, air, fire and water. -
John Dalton Born
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Dalton and his Diary
In this time John Dalton started his Diary of 200,000 meteorite observations. This helped the scientific community because it gave years of insight into this field. -
John Dalton and gas
John Dalton wrote essays on his famous experiments some experiments use compression of gas and water vapor. -
Royal Medal for John Dalton
John Dalton had gotten a Royal Medal at this time -
John Dalton died
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Henri Becquerel Born
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J.J Thompson Born
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Curie Pierre Born
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Ernest Rutherford Born
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Neils Bhor Born
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J Chadwick Born
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Marie Pierre Born
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J.J Thompson discovers electron
A electron is a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. -
Henri Becquerel Radiation Theory
In 1896, French scientist Antoine Henri Becquerel discovered radioactivity which was an early contribution to atomic theory. He discovered this phenomenon while experimenting with uranium and a photographic plate. -
Marie Pierre discovered xrays
X-ray beams pass through objects, and they are absorbed in different amounts depending on the density of the material they pass through. Dense materials, such as bone and metal, show up as white on X-rays. -
Curie Pierre discovered polonium & radium
Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is silvery-white. Polonium is a chemical element with symbol Po and atomic number 84. A rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium. -
J.J Thompson greatest Student
J.J Thompson toke on Ernest Rutherford as a student. -
Henri Becquerel Deflected beta particles
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Henri Becquerel Nobel prize
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J.J Thompson structure
J.J Thompson created the plumb pudding structure -
Henri Becquerel Died
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Student beats Master
Ernest Rutherford proved J.J Thompson pudding structure wrong. -
Ernest Rutherford Noble Prize
He won this Nobel prize because of his Disintegration Theory -
Bohr Model
The Bohr model shows that the electrons in atoms are in orbits of differing energy around the nucleus. -
Neils Bohr becomes a professor
He becomes a professor at the University of Copenhagen -
Ernest Rutherford changes a element
For the first time in the world a phyisicist changes one element into another. -
J Chadwick proved a neutral partical and a proton had the same mass
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J Chadwick discovered neutron
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Marie Pierre Death
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Ernest Ruthrford Death
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Neil Bohr explains basics of nuclear fission
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J.J Thompson died
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Neil Bohr's Death
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J Chadwick Death
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Marie pierre noble prize
This is the first women to win the noble prize.
