Page Review questions: Page 16, #1,2,3,4,7

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Presentation transcript:

Page 11-14 Review questions: Page 16, #1,2,3,4,7 Atomic Theory Page 11-14 Review questions: Page 16, #1,2,3,4,7

History of the atom What is an atom? What is it made up of? What does it look like? What properties does it have?

John Dalton (1809) He thought atoms were solid spheres, like billiard balls Proposed theory:

J.J. Thomson (1897) Discovered particles smaller than atoms that were ___________ charged Called it the ____________ Thought they were spaced evenly throughout Dalton’s “spheres”, like blueberries in a muffin Electrons in a cathode ray tube

Ernest Rutherford (1909) Gold foil experiment Shot high energy alpha particles (a helium nucleus) at very thin foils of gold Observed:

Ernest Rutherford (1909) Gold foil experiment Shot high energy alpha particles (a helium nucleus) at very thin foils of gold Concluded:

James Chadwick (1932) Discovered the __________, a ____________ charged particle also found in the nucleus

Niels Bohr (1920)

Niels Bohr (1920)

Niels Bohr (1920) Electrons are not randomly scattered around an atom Instead, found: Like _______________ First orbital holds __ electrons Second holds __ electrons Third orbital holds __ (up to __) electrons Gets more complicated with more than 20 electrons

Bohr-Rutherford Diagrams Know how to draw!