Ch.7 Unit Test Practice

Most of an atom is empty space.

• True

• False

In an atom, an electron that is close to the nucleus is on the highest energy level.

• True

• False

The energy of an electron varies depending upon which energy level that electron occupies.

• True

• False

Thompson's experiments led to the discovery of the _________.

• electron

• neutron

• proton

• quark

In order for an atom to be neutral, the number of protons must equal the number of ______________.

• electrons

• protons

• neutrons

• quarks

The idea of the atom was first proposed by

• Dalton

• Ancient Greeks

• Rutherford

• Thomson

An element can be identified by the number of ______ in its nucleus.

• electrons

• protons

• neitrons

• quarks

The mass of an _______ is about equal to the mass of a proton.

• proton

• neutron

• electron

• quark

Who determined that cathode rays are negatively charged?

• Aristotle

• Dalton

• Rutherford

• Thomson

Which of the following found that atoms have a nucleus?

• Aristotle

• Dalton

• Rutherford

• Thomson