Compounds formed by pure covalent bonds:
- Hydrogen (H2)
- Chlorine (Cl2)
- Nitrogen (N2)
Compounds formed by polar covalent bonds:
- Water (H2O)
- Carbon dioxide (CO2)
- Ammonia (NH3)
Compounds formed by dative covalent bonds:
- Ammonium ion (NH4+)
- Hydronium ion (H3O+)
- Hydroxide ion (OH-)