Structure of the Atom Quiz

Early Greek philosophers had differing ideas about matter. Democritus believed that matter was made up of

• empty space

• atoms

• water

• fire

Early Greek philosophers had differing ideas about matter. Aristotle said that _________________ cannot exist

• atoms

• empty space

• water

• fire

Why were Democritus's ideas not science?

• They were partially incorrect.

• They went against ideas of more influential philosophers.

• They were not supported by experiment.

• They were ahead of their time.

Aristotle's ideas gained greater acceptance because ______.

• empty space cannot exist.

• he was one of the most influential philosophers of his time

• he backed up his ideas with experimental evidence.

• he tested his ideas.

Which of the following parts of John Dalton's atomic theory were not correct?

• matter is composed of atoms

• atoms of one element differ from atoms of another

• atoms combine to form compounds

• atoms are indivisible

In the figure below, if atoms of element A have a mass of 16 units and atoms of element B have a mass of 1 unit, what will be the total mass?

• 72 units

• 17 units

• 12 units

• 18 units

Which letter represents a proton?

• D

• C

• A

• B

What can you conclude from the deflection of a cathode ray in a magnetic field?

• The ray must need to travel in a vacuum.

• The ray must be composed of charged particles.

• The ray must have a positive charge.

• The ray must be composed of iron.

Which subatomic particle was discovered by researchers working with cathode-ray tubes?

• neutron

• electron

• quark

• proton

What is the negatively-charged particle in an atom?

• electron

• neutron

• positron

• proton