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1925 BCE
Heisenberg
He proposed the uncertainty principle. This principle states that one can never know the exact location and energy of an electron simmutaneously -
1913 BCE
Neils Bohr
proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level to another. The element bohrium was named after him. -
1908 BCE
Ernest Rutherford
He was awarded the Nobel Prize in Chemistry in 1908 "for his investigations into the disintegration of the elements, and the chemistry of radioactive substances". -
1897 BCE
J.J Thomson
Discovered the electron with the dicovery of his subatomic particle -
1885 BCE
Eugene goldstine
He was an early investigator of discharge tubes, the discoverer of anode rays, and is sometimes credited with the discovery of the proton. Discovered positive particles. He noted that the particles had a charge equal and opposite to the electron. -
1869 BCE
Mendeleev
Created the periodic table which organizes elements according to similarity -
1803 BCE
Dalton
Believed all matter was created by atoms, which he believed where indestructible. Also that that atoms of given elements are identical in their mass and properties -
460 BCE
Democritus
He proposed that all matter including space and time, was made up of small units named atoms. -
Chadwick
Dicovered the Neutron. Neitrons help balance protons.
