Atoms

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What are the three main subatomic particles of an atom?

Back

Protons, neutrons, and electrons.

Front

Where are protons located in an atom?

Back

Protons are located in the nucleus of an atom.

Front

What charge do protons carry?

Back

Protons carry a positive charge.

Front

What charge do neutrons carry?

Back

Neutrons carry no charge (they are neutral).

Front

What charge do electrons carry?

Back

Electrons carry a negative charge.

Front

How do you determine the atomic number of an element?

Back

The atomic number is determined by the number of protons in the nucleus.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus.

Front

How many neutrons are in the most common isotope of potassium?

Back

20.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.