Phy Sci 6ed Chap 3 Review

Who proposed the plum pudding model in atomic theory?

• Ernest Rutherford

• Niels Bohr

• J. J. Thomson

• John Dalton

Which of the following statements about Rutherford's gold foil experiment is incorrect?

• Most alpha particles passed straight through the gold foil.

• Some alpha particles were deflected at large angles.

• Alpha particles were absorbed by the gold foil.

• A small fraction of alpha particles were deflected back towards the source.

According to the Bohr model, what is the movement of electrons?

• They move in a flat ring around a massive, positively charged center.

• They move only in distinct, spherical orbits at fixed distances from the nucleus.

• They move randomly about the nucleus.

• They move rapidly throughout a uniform, positively charged matrix.

Democritus was the first to propose the existence of indivisible particles called atoms.

• True

• False

According to John Dalton's atomic theory, atoms can be divided into smaller particles.

• True

• False

The quantum-mechanical model is currently accepted by scientists because it can accurately determine the exact positions of electrons within an atom.

• True

• False

Who proposed the theory that matter existed in the form of very small, indivisible particles?

• Newton

• Einstein

• Democritus

• Bohr

According to the principles of electrostatics, what happens when two like charges come into contact?

• They neutralize each other.

• They attract each other.

• They repel each other.

• They create a magnetic field.

Ernest Rutherford is credited with the discovery of the

• electron

• neutron

• proton

• atom

Experiments related to ____ led to the discovery of the nucleus

• alpha particles and gold foil

• the physical properties of liquids

• Thomson tubes and anode rays

• beta particles and lead foil