What I've learnt this week:

1. We have to use Lewis Dot and Cross Diagram for covalent compounds.
   E.g: Ammonia:

• Lone pair of electrons: electrons are unshared
• Bond pair of electrons: electrons are shared.

2. Dative Covalent Bond:

• A type of covalent bond where the shared pair of electrons comes from one atom only.

3. Sigma bond, Pi bond

4. Shape of particular molecules

(continue next time)