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Atomic Structure

TermDefinition
What is an atom The smallest part of an element that still retains the properties of that element
Who was the first person to introduce the idea of elements (Irish) Robert Boyle
4 points of Dalton's atomic theory 1. atoms were indestructible and indivisible 2. Atoms of a particular element are identical to each other and have the same chemical properties 3. Atoms of different elements vary in mass 4. A compound contains two or more elements joined together in
Two limitations of Dalton' atomic theory Point 1 is untrue Point 2 has the exception of isotopes
Who invented the plum pudding model of the atom Thomson
What was the plum pudding model atoms were solid positively charged spheres with negatively charged electrons dispersed randomly throughout.
Limitation of plum pudding model Not based on experimental evidence
Who discovered the nucleus rutherford
What was Rutherford's experiment called a- particle scattering experiment
describe the a - particle scattering experiment a- particles were fired at a thin sheet of gold foil. the whole apparatus was surrounded by a detecting screen.
what was expected by Rutherford in the a - particle scattering experiment according to the plum pudding model - most particles would go straight through the gold foil, and some would be deflected slightly due to them encountering a similar charge.
What unexpected results did Rutherford observe? some particles were deflected at very large angles (>90) and very few even rebounded right back along their own path
What did Rutherford conclude from his experiment nearly all the mass of an atom is located in a tiny dense positive region called the nucleus. most of the atom is made up of empty space. the electrons move around in this space but occupy very little of it.
Limitations of Rutherford's model of the atom electrons are negative and should then be attracted to the positive charge of the nucleus causing them to spiral into it thus destroying the atom (this does not happen)
Created by: user-1990742
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