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Atomic Structure
Test Questions
9
Chemistry
12th Grade
02/14/2011

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Cards

Term
Democritus
Definition
Atomos
Term
John Dalton
Definition
Modern Atomic Theory
Term
William Crookes
Definition
Cathocle Ray Tube
CRT
Crookes Tube
Term
JJ Thomson
Definition
Discovered the e- (electron) particle
1/2000 times the mass of an H atom
Term
Ernest Rutherford
Definition
Discovered the "nucleus" and protons
Term
James Chadwick
Definition
Discovered the neutron
The nucleus had to have another particle to stop the protons from repelling
Term
Niels Bohr
Definition
Proposed that e- must move along fixed paths called orbits withe the e- cloud
Term
Isotopes
Definition
The atoms with the same number of protons but different numbers of neutrons
Term
Mass number
Definition
The number that represents the sum of the number of protons and neutrons in the nucleus
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