Lewis Structure - Exceptions

Question 1

What are the Steps for Drawing Lewis Structures?

Answer 1

1. Least electronegative atom is in center.
2. Hydrogen cannot be central atom.
3. Determine shared electrons and number of bonds. (shared=need-available, S=N-A).
4. Positive charge subtract electron from A.
5. Negative charge add electron to A.
6. Arrange remainder of electrons to fill octets.
7. Is there a different possible arrangement that doesn’t affect the structure?

Question 2

What are the Electronegativity Trends across the Periodic Table?

Answer 2

It Increases from the bottom left of the table to the top right of the table.

Question 3

What is Resonance (chemistry)?

Answer 3

In chemistry, resonance or mesomerism [1] is a quantum superposition of wave functions built from several contributing structures [2] (also called resonance structures or canonical forms) as a way of describing delocalized electrons within certain molecules or polyatomic ions.