Atomic Models 2

Rutherford realized that the atomic nucleus was positively charged because

• it attracted alpha particles.

• it deflected alpha particles.

• it had no effect on alpha particles.

• it produced alpha particles.

Which of the following is the best evidence that the particles that make up a cathode ray had a negative charge?

• The particles were produced by many different metals.

• The ray was deflected toward a positive electric field.

• Line emission spectra for an element are always the same.

• The ray caused a phosphorescent screen to glow.

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.

JJ Thomson's experiment that he used to discover electrons

• gold foil experiment

• cathode ray experiment

• neither of these is correct

What results did Rutherford observe in his Gold-Foil experiment?

• He observed that all alpha particles did go through a gold-foil in straight lines

• He observed that most alpha particles did not go through a gold-foil and stopped on one side of the gold foil.

• He observed that a small number of alpha particles bounced off the gold-foil at very large angles

• He observed that all alpha particles slightly deflected from the straight line when going through a gold-foil

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Which of these had scientific evidence to back their models of the atom?

• Democritus

• John Dalton

• J.J. Thomson

• Ernest Rutherford

What does the word "atomos" mean?

• science is cool

• not reactive

• unable to be cut or divided

• small

What is a nucleus?

• An atom’s central region, which is made up of protons and neutrons

• Subatomic particles that have negative charges

• subatomic particles that have positive charges

• Subatomic particles that have neutral charges

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what is the function of the proton

• all of the below

• to keep the electrons away from the nucleus

• to keep the electrons from going out of the atom

• none of the above

Ernest Rutherford discovered that atoms were mostly _________________. 

• negatively charged
• positively charged
• electrons
• empty space.