Chemistry Revision

The Nucleus is in the middle of the atom and it contains protons and neutrons. The atom has a positive charge because of the protons. The electrons move around the nucleus in electron shells. They're negatively charged and tiny, but they cover a lot of space.

Protons are heavy and positvely charged.

Neutrons are heavy and neutral.

Electrons are tiny and negatively charged.

Number of Protons equals number of electrons.

Atoms are neutral as they have no charge. This is usually because they have the same number of protons as electrons. The charge on the electrons is the same size as the charge on the protons. but opposite - so the charger cancel out.

An ion is an atom or group of atoms that has lost or gained…