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Timeline Of Atomic Theory
Transcript of Timeline Of Atomic Theory
400 BC Democristus Dalton Model 1803 Thomson Model 1897 His theory, matter could not be divided into smaller and smaller pieces forever, eventually the smallest possible piece would be obtained.
This piece would be invisible.
He named the smallest piece of matter "atoms" meaning "not to be cut". His theory, deduced that all elements are composed of atoms. Atoms are indivisible and indestrutible particles.
Atoms of the same element are exactly alike.
Atoms of different elements are different. His theory, stated that an atom is made of even smaller particles.
Atoms were made from a positively charged substance with negatively charged electrons, scattered about, like raisins in a pudding.
Also called "Plum Pudding" Atomic Theory Timeline Rutherford Model 1911 His theory, positively charged "bullets" passed right through the gold atoms.
Some of the positively charged "bullets" however were repel.
Atoms are mostly open space.
An atom had a small, dense , positively charged center.
He called the center of the atom "nucleus".
Electrons move in definite orbits around the nucleus. Bohr Model 1922
His theory, he placed each electron in specific energy level. These orbits or energy levels are located at certain distances from the nucleus. Wave Model Modern Electrons don't move about an atom in a definite path
Impossible to determine the exact location of an electron.