Atoms

Atoms

1. Structure

   • Tiny particles that everything is made up of
   • Radius of 0.1 nm (1x10^-10m)

2. Nucleus and electrons

   • Nucleus is the middle of the atom that contains protons and neutrons
     • Protons are positive and neutrons have no charge. This makes the nucleus positive
   • Electrons move around the nucleus with a negative charge. They occupy shells around the nucleus.

3. Electrical Charge

   • Number of protons always equals the number of electrons in an atom.
     • E.g. Atom has 7 protons and electrons. Each proton has a charge of +1 and electron has a charge of -1. There are 7 each so they cancel eachother out so there is no charge.
   • If more are added there is a charge and becomes an ion.

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