Lewis Structure - Polyatomic Ions

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.

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

Which is the best one for (CN-)?

Answer 3

Two each with double bonds.