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460 BCE
Democratus
He formed the atomic theory -
Antoine Lavoisier
"Father of Modern Chemistry" -
Law of conservation of mass
In a chemical reaction, matter is neither created or destroyed. -
John Dalton
Said that all matter is made of atoms, atoms are indivisible and indestructible. -
Dalton's Atomic theory
Concluded with 4 major points that his theory was correct on how Atoms functioned. It is still valid to this day. -
Dmitri Mendeleez
Developed the periodic law -
J.J. Thomson
He created many books on physics, mathematical & chemistry theory -
Cathode Ray Tube
A high vacuum tube, which led to the creation of monitors and TV screens. -
Plum pudding Atomic model
A model of an atom created by J.J. Thomson -
Ernest Rutherford
First man to split an atom -
Gold Foil Experiment
Concluded that tiny dense nuclei were reflecting some of the particles away from the foil. -
Robert Millikan
Came up with a way to measure an electron's charge. -
Rutherford model
suggested the plum model was incorrect -
Niels Bohr
Proposed that energy is transferred in certain well defined quantities -
Bohr Planetary Model
A model that showed that electrons orbit the nucleus of an atom. -
Erwin Schrodinger
Used a mathematical equation to determine the likelihood of an electron being in a certain place -
Electron Cloud Model
Used to describe where electrons go when they orbit the nucleus of an atom. -
Quantum Mechanical Model
A model of an atom that uses complex shapes of orbital patterns where there are likely electrons -
James Chadwick
Created an unknown radiation that became known as the neutron -
Henry Moseley
Justifies physical laws of the previous empirical & chemical concept of the atomic #