Atomic Structure

Front

What must be true for an atom to be neutral?

Back

The atom has the same number of protons and electrons.

Front

What does the atomic number represent?

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.

Front

How is the identity of an element determined?

Back

By the number of protons in its nucleus.

Front

What particles are found in the nucleus of an atom?

Back

Protons and neutrons.

Front

What is the charge of a proton?

Back

Positive.

Front

What is the charge of a neutron?

Back

Neutral.

Front

What is the charge of an electron?

Back

Negative.

Front

How do you calculate the mass number of an atom?

Back

Add the number of protons and neutrons.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average of isotopes, while mass number is the total number of protons and neutrons.