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430 BCE
Democritus proclaims the atom
the atom is proclaimed as the simplest unit of matter, recognizing all matter being composed of atoms; which is still taught today. -
300 BCE
four elements
Aristotle claims there are only four elements: water, earth, fire, and air. This led to how matter is classified. -
fundamental gas laws
Sir Robert Boyle formulates the fundamental gas laws stating that when pressure on a gas is decreased the volume increases which since then has been proven true. Boyle's Law and Avogadro's Law are the other two parts of these laws. -
electrical resistance
Simon Ohm created a law applying to how electricity reacts with a circuit. His findings tell that currents passing through most materials are directly proportional to the difference applied to them. Which is obviously important considering it is still considered today. -
xrays
The x-ray was accidentally discovered by Wilhelm Roentgen after he noticed a bottle of barium plantinocyanide was glowing. Today x-rays are used in order to photograph and detect things such as tumors that cant just be detected. -
protons within the nucleus
Henry Moseley attempted to use an x-ray to determine if there were protons within he nucleus of an atom. He was unsuccessful because neutrons were not yet discovered. -
neutron
The neutron is finally discovered by James Chadwick. Leading to scientists having a better understanding of atoms. -
artificial radioactive elements
Irene Curie and Fredric Joliot-Curie discover that it is possible to create radio active elements artificially in a lab making the materials more accessible and easier to produce energy. -
Manhattan project
Albert Einstein and Enrico Fermi warn the us of
Germany's excessive research on atomic fission reaction. The us creates its first working nuclear fission reactor under neath the university of Chicago football field
