Atomic mass

Definition

Atomic mass is the total weight of an atom, primarily determined by the sum of its protons and neutrons located in the nucleus. It is measured in atomic mass units (amu), where one amu is approximately equal to the mass of a single proton or neutron.

Related terms

Proton:

A positively charged particle found within an atom's nucleus that contributes to its atomic mass.

Neutron:

A neutral particle (having no charge) found within an atom's nucleus that adds to its atomic mass without affecting its electrical charge.

Electron:

A negatively charged particle orbiting an atom's nucleus, which has a negligible mass compared to protons and neutrons but plays a critical role in chemical bonding and reactions