Atomic Theory mini-Assessment

Who first came up with the idea that matter is composed of tiny particles?

• Antoine Lavoisier

• Leucippus and Democritus

• Eugen Goldstein

• James Dalton

What did Leucippus and Democritus call the tiny particles they believed matter was composed of?

• Particles

• Ions

• Atoms

• Molecules

What did J.J. Thompson call the negatively charged particles he discovered in the discharge tube?

• Corpuscles

• Electrons

• Protons

• Neutrons

What did Ernest Rutherford discover about the charge of an atom's nucleus?

• It has a positive charge

• It has a negative charge

• It has no charge

• It has a neutral charge

What did Niels Bohr's model of the atom propose about the arrangement of electrons?

• They are randomly distributed

• They are in circular orbits

• They are in straight lines

• They are in a cloud formation

What did Werner Heisenberg's quantum theory propose about the arrangement of electrons around a nucleus?

• They are in a cloud formation

• They are in circular orbits

• They are in straight lines

• They are randomly distributed

What did the gold foil experiment conducted by Ernest Rutherford reveal about the atom?

• The atom has a negative charge

• The atom is solid throughout

• The atom has a positive charge

• The atom is mostly empty space

What did Eugen Goldstein discover about the discharge tube?

• It emitted no light at all

• It emitted light from the negative electrode

• It emitted light from both electrodes

• It emitted light from the positive electrode

What did the French chemist Antoine Lavoisier propose about the law of conservation of mass?

• Matter changes neither form nor mass

• Matter changes mass but not form

• Matter changes form but not mass

• Matter changes shape but not mass

What did the German physicist Eugen Goldstein conclude about the mass of the cathode rays?

• The mass was lighter than hydrogen

• The mass was equal to hydrogen

• The mass was heavier than hydrogen

• The mass was unknown

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SC912P.8.3