Atomic Number and Atomic Mass

Front

What is the atomic number?

Back

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

Front

What is the atomic mass?

Back

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

Front

Can you round the atomic mass?

Back

Yes, always round the mass.

Front

What determines what element an atom is?

Back

The number of protons determines what element an atom is.

Front

What is the mass number defined as?

Back

The mass number is defined as the total number of protons and neutrons in an atom's nucleus.

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

How do you calculate the atomic mass of an element?

Back

The atomic mass is calculated by taking the weighted average of the masses of all the element's isotopes.

Front

What is the relationship between atomic number and protons?

Back

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

Front

What is the difference between atomic mass and mass number?

Back

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

Front

What role do neutrons play in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus.