Atomic Structure

Front

What is the mass number of an atom?

Back

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

Front

In a neutral atom, what is the relationship between protons and electrons?

Back

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

Front

Which subatomic particle has a positive charge?

Back

Protons have a positive charge.

Front

What is the atomic number of an atom?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

How do you calculate the number of neutrons in an atom?

Back

Subtract the atomic number from the mass number to find the number of neutrons.

Front

What are the three main subatomic particles?

Back

The three main subatomic particles are protons, neutrons, and electrons.

Front

What charge do electrons carry?

Back

Electrons carry a negative charge.

Front

What is the role of neutrons in an atom?

Back

Neutrons help stabilize the nucleus by offsetting the repulsive forces between protons.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the significance of the atomic mass unit (amu)?

Back

The atomic mass unit is a standard unit of mass that quantifies mass on an atomic or molecular scale.