Classification of element

Atom

The smallest particle of an element

Three subatomic particles

Proton, neutrons and electrons

Electron

Particle with negative charge

Proton

Particle with positive charge

Neutron

Neutral particle with no charge

Nucleus

Contain protons and neutron

The number of electrons in an atom

Equal to the number of protons

Charge of atom

Neutral

Molecules

Made up of two or more atoms

Element

The simplest form of substance