Atomic Theory

The first person to propose a theory about an atom called the Atomos Theory was

• Democritus
• Rutherford
• Dalton
• Aristotle

"Everything is composed of atoms" was stated by:

• Democritis
• Dalton
• Moseley
• Einstein

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The word "atom" comes from a Greek word that means

• Invisible
• Indivisible
• Undivided

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

• Bohr
• Rutherford
• Dalton
• Thomson

How did Thomson build upon Dalton's model? 

• His model was the same.
• He put electrons in orbitals.
• He discovered the nucleus.
• He discovere subatomic particles (electron).
  

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Thomson
• Ernest Rutherford
• John Dalton
• Democritus

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He discovered the electron using cathode ray tube experiment.

• Joseph Thomson
• John Dalton
• Ernest Rutherford
• Robert Millikan

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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NGSS.MS-PS1-1

Who discovered the nucleus using the gold foil experiment?

• Democritus
• Robert Millikan
• James Chadwick
• Ernest Rutherford