Atomic Number, Atomic Mass

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is atomic mass?

Back

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

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

Back

To find the number of neutrons, subtract the atomic number (number of protons) from the atomic mass (rounded to the nearest whole number).

Front

What subatomic particle has a positive charge?

Back

Protons have a positive charge.

Front

What subatomic particle has no charge?

Back

Neutrons have no charge.

Front

What subatomic particle has a negative charge?

Back

Electrons have a negative charge.

Front

How many protons does a carbon atom have?

Back

A carbon atom has 6 protons.

Front

What is the relationship between atomic number and the number of protons?

Back

The atomic number is equal to the number of protons in an atom.

Front

If an atom has an atomic number of 7, how many electrons does it have?

Back

It has 7 electrons, assuming the atom is neutral.

Front

What is the atomic mass of carbon-12?

Back

The atomic mass of carbon-12 is approximately 12 amu.