Atoms:
The Nucleus:
- Centre of the atom.
- Contains PROTONS and NEUTRONS.
- Due to the protons it has a positive charge.
- Nearly the whole mass of the atom is concentrated in the nucleus.

The Electrons:
- Move AROUND the nucleus.
- NEGATIVELY CHARGED.
- Cover a large amount of space, despite small size.
- Practically no mass.
- They're arranged in SHELLS around the NUCLEUS.

Protons - Heavy and positively charged.
Neutrons - Heavy and neutral.
Electrons - Tiny and negatively charged.
~The charge on the electrons is the same size as the protons, except opposite.
~ When an atom becomes charged it is then called an ion.
~ There are the same amount of neutrons as protons.

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