Atom

The atom is the basic particle of the Chemical Elements. An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically-bound swarm of electrons.

Atom

Smallest particle into which an element can be divided while still retaining the chemical characteristics of that element.

Nucleus

• Protons & Neutrons
• Same mass
• Often same number of both

Electrons orbit around the nucleus

• Negative charge
• Negligible mass