Atomic Theory

Who stated that atoms cannot be divided?

• Schrodinger

• Dalton

• Thomson

• Bohr

Who said: "In an atom, electrons move in definite orbits around the nucleus."

• Thomson

• Rutherford

• Bohr

• Democritus

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. 

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.

Who came up with the model of an atom pictured?

• J.J. Thompson

• Ernest Rutherford

• Niels Bohr

• James Chadwick

He discovered the electron using cathode ray tube experiment.

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

He first measured the mass and charge of an electron using the oil drop experiment.

• Joseph Thomson
• Robert Millikan
• John Dalton
• Niels Bohr

How did Thomson build upon Dalton's model?

• His model was the same.

• He put electrons in orbitals.

• He discovered the nucleus.

• He discovered subatomic particles (electron).

• He discovered subatomic particles (proton).

Whose model is this?

• Millikan

• Rutherford

• Thomson

• Bohr