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Phy Sci-Atomic Theo

WSHS - Physical Science 3rd - Atomic Theory Terms/Names

QuestionAnswer
John Dalton (1803) his theory suggested all matter is made of individual particles called atoms which can’t be divided; all elements are composed of atoms; all atoms of the same element have the same mass and atoms of different elements have different masses; compoun
Ernest Rutherford (1909) performed the famous gold-foil experiment that proved the existence of the nucleus; in his model of the atom, the nucleus is the dense, positively charged center of the atom with electron (negative particles) moving randomly around the nucleus
JJ Thomson (1898) he presented the first evidence of sub-atomic particles; his model is sometimes called “plum pudding”
“plum pudding” Thomson’s theory that states positive and negative charges are evenly distributed throughout the atom, making it overall neutral
Niels Bohr (1885-1962) a Danish physicist who worked with Rutherford; Bohr’s model focused on the electrons; this is the centerpiece of the modern atomic model; electrons move with constant speed and in fixed orbits
Democritus (400 BC); ancient Greece; coined the term “atoms” which meant uncut or indivisible, he believed there could be a limit to the number of times a substance could be divided
Aristotle (400-350BC); believed there was no limit to the number of time an atom could be divided
nucleus the center of the atom
protons positive charge
electrons negative charge
neutrons no charge (neutral charge)
electron cloud describes the possible locations of elements around the nucleus; an electron can move from one energy level to another as the atom gains or loses energy
Created by: ktedder
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