Atomic Theory

The smallest particle of an element that shows all the properties of that element.

• Subatomic Particles

• Atom

• Quarks

• Gluons

Where electrons are likely to be found as they travel around the nucleus

• Nucleus
• Electron Cloud
• Within a Proton
• Within a Neutron

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A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass

• Electron Shells
• Orbitals
• Electron Cloud
• Nucleus

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Believed that atoms of the same element are identical to each other

• Bohr
• Rutherford
• Dalton
• Thomson

How did Rutherford discover the proton?

• Cathode tube ray experiment
• Gold Foil Experiment
• Planetary Model
• Plum Pudding Model

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True or False: The majority of an atom is made up of empty space

• True
• False

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Electrons can be found in

• The protons
• The nucleus
• Electron Clouds

What contribution did John Dalton make to atomic theory? 

• He discovered that every atom was positively charged. 
• He discovered that every element consisted of one type of atom that couldn't be divided. 
• He discovered that atoms had nuclei. 
• He discovered that atoms could be divided into smaller parts. 

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Rutherford's gold foil experiment provided evidence that...

• negative and positive charges are spread evenly throughout the atom.
• alpha particles have a positive charge.
• gold is not a dense as previously thought.
• there is a dense positively charged nucleus at the center of an atom.

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Who came up with the model of an atom pictured?

• J.J. Thompson
• Ernest Rutherford
• Neils Bohr
• James Chadwick

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