Lewis Dot DiagramsLewis Dot Diagrams1.1. How many electrons are in a stable How many electrons are in a stable

octet?octet?

2.2. To what electrons does a stable octet To what electrons does a stable octet refer? (Valence, inner, third energy level)refer? (Valence, inner, third energy level)

3.3. How many electrons does a “stable How many electrons does a “stable octet” of hydrogen contain?octet” of hydrogen contain?

4.4. Why is a stable octet different for Why is a stable octet different for hydrogen than for the other elements.hydrogen than for the other elements.

5.5. When a bond forms, how many electrons When a bond forms, how many electrons must be involved in the bond.must be involved in the bond.

Eight valence electrons are in a stable octet

Eight valence electrons are in a stable octet

Two valence electrons are in a stable octet for hydrogen.

Hydrogen has only the 1s orbital to fill.

A pair of electrons (2 e-) are shared to make a bond.

To draw a simple Lewis Dot To draw a simple Lewis Dot diagram for HCldiagram for HCl

H Cl

Hydrogen has one valence electron

Chlorine has seven valence electrons

When a bond forms, the hydrogen has two valenceelectrons

And the chlorine has eight valence electrons

To draw a simple Lewis Dot To draw a simple Lewis Dot diagram for CCldiagram for CCl44

C

Carbon has four valence electrons

Cl

Chlorine has seven valence electrons

When a bond forms, the chlorine has eight valenceelectronsand the carbon gains one extra electron from eachChlorine until it has eight valence electrons

Cl

Cl Cl

QuestionsQuestions

1.1. How many valence electrons are How many valence electrons are involved in a bond?involved in a bond?

2.2. How many electrons will each atom How many electrons will each atom (except H) end up with after it (except H) end up with after it forms a bond?forms a bond?

3.3. Can more than one atom bond at Can more than one atom bond at the same time?the same time?

Two valence electrons are shared in a bond.

Eight valence electrons are obtained by each atom.

Yes.

What happens if there aren’t What happens if there aren’t enough electrons?enough electrons?

CO

Oxygen has six valence electrons, Carbon has four.

With two oxygen atoms, there are a total of 2(6) + 4 = 12 + 4 = 16 electrons

O

OOPS!

OOPS!

Quiz: Exit PassQuiz: Exit Pass

Write the following Lewis Dot Write the following Lewis Dot DiagramsDiagrams– CC– FF– NN– SS– OO

– CFCF44

– SOSO22