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460 BCE
Democritus
Said that everything had to made up of something and they have to atoms -
277 BCE
Aristotle
Rejected the concept of the atom -
Making of vaccinations
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Antonie Lavosier
Found the elements Carbon, hydrogen, and oxygen -
Joseph Proust
Stated the law of definite proportions -
John Dalton
Said that all matter is composed of small particles called atoms. All atoms of a given element are identical, having the same size, mass, and chemical properties -
Amedeo Avogadro
Avogadro hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules -
First steam engine
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First camera
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William Crookes
Discovered thallium -
The first car
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Ernest Rutherford
identified a simpler way to detect radio waves -
Madame Curie
Discovered rays that could travel through solid wood and flesh -
J.J. Thomson
Discovered the electron -
Max Planck
Founder of the quantum Theory -
First flight
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Henri Becquerel
Discovered radioactivity through his investigations of uranium and other substances -
Robert Millikan
Measured the charge of an elevtron -
James Chadwick
Discovered the Neutron -
henry Moseley
Discovered the wavelength of an x-ray becomes shorter as the atomic weigh increases -
Albert Einstein
Explained the photoelectric effect -
Niels Bohr
Explained what happens in an atom. Created a picture of the atomic structure -
Erwin Schrodinger
Combined the equations for the behavior of eves with the De Broglie equation to come up with the mathematical model for the distribution of electrons of an atom -
Louis De Broglie
Discovered the wave mechanics theory -
Werner Heisenberg
Discovered the theory of quantum mechanics and its applications. resulted in the discovery of allotropic forms of hydrogen -
Declaration of human rights
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Discovery of the internet
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First cell phone
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First radio
