The Atom

Nucleus

This is a group of protons and neutrons in the center of all atoms.

Electron

This is a subatomic particle with a negative charge and very little mass.

Proton

This is a subatomic particle with a positive charge and a mass of 1 amu.

Neutron

This is a subatomic particle with no charge and a mass of 1 amu.

Ion

This is an atom that has lost or gained electrons.

Atom

This is the basic building block of all matter.

Isotopes

Atoms of the same element with varying number of neutrons.