Chapter 3 PRACTICE Test: Atomic Structure and Counting Atoms

Front

What is the unit of measurement of mass for subatomic particles, equal to 1/12 of the mass of a carbon-12 atom?

Back

Atomic mass unit (amu)

Front

Which experiment led to the discovery of the electron?

Back

Cathode ray experiment

Front

What do neutral atoms contain equal numbers of?

Back

Protons and electrons

Front

If a carbon isotope consists of 6 protons, 6 electrons, and 7 neutrons, what is its mass number?

Back

13

Front

What is the subatomic particle located in the nucleus, with no charge and a mass of 1 amu?

Back

Neutron

Front

What is the charge of a proton?

Back

Positive charge

Front

What is the charge of an electron?

Back

Negative charge

Front

What is the charge of a neutron?

Back

No charge (neutral)

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus.