Atomic History and Isotopes Review

Who stated that atoms cannot be divided?

• Democritus
• Dalton
• Thomson
• Bohr

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

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

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. 

Place the following scientists in order, from earliest to latest: 
Rutherford, Dalton, Bohr, Thomson

• Dalton, Rutherford, Bohr, Thomson
• Thomson, Dalton, Rutherford, Bohr
• Dalton, Thomson, Rutherford, Bohr
• Bohr, Dalton, Rutherford, Thomson

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.

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

• Democritus
• Rutherford
• Dalton
• Aristotle

Who discovered the nucleus using the gold foil experiment?

• Democritus
• Robert Millikan
• James Chadwick
• Ernest Rutherford

He discovered the electron using cathode ray tube experiment.

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

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).
  

Who's model is this? 

• Millikan
• Rutherford
• Thomson
• Bohr