Atoms + Elements

Atoms + Elements

1. Atoms have a small nucleus surrounded by electrons

   • Nucleus is in the middle
   • Nucleus has a positive charge
     • Overall because of the protons
   • It contains protons and Neutrons
     • Protons and positively charged
     • Neutrons have no charge
       • Neutral
   • Size wise the nucleus is tiny compared to the rest of the atoms

2. Electrons

   • They're negatively charged
   • They move around the nucleus
   • They're tiny but cover a lot of space
   • They occupy shells around the nucleus
     • These shells explain the whole of chemistry

3. Number of protons equals the number of electrons

   • The charge of the electrons is the same size as the charge on the protons
     • Just opposite
   • This means the number of protons always equals the number of electrons in an atom
   • If some electrons are added or removed the atom becomes charged and then is an ion