Energy levels

The Atom:

1. What atoms are made of?         Nucleus - mass and charge       Electrons       Ions          Specific charge

2. Planetary model of the atom - phet            Bohr Model              Energy levels and spectra           Ionization energy and ground state

3. Discharge tube and excitation by collisions        De-excitation and emission spectra

4. Excitation by light - phet           Absorption spectroscopy

5. Landscape of the micro world