Molecular Shapes and Lewis Diagrams

Lewis Dot Structure

Lewis Electron Dot Structure

A model used to illustrate the electrons in the outermost energy level of an atom

It helps picture out the Octet Rule and how chemical bonding takes place between elements

Lewis Electron Dot Structure

The chemical symbol of an element is surrounded by a number of dots which are the valence electrons.

Multiple Choice

The outermost electrons of an atom are __________.

• outermost electron

• octet electrons

• valence electrons

• Lewis electrons

Octet Rule or Rule of Eight

• Elements with with complete number of electron are those with 8 valence electrons and they are described as STABLE ELEMENTS

• Elements with incomplete number of valence electrons are those with less than 8 valence electrons and they are described as UNSTABLE ELEMENTS

Octet Rule Exemption

The element Helium (₂He) is exemption to this rule. Since helium has 2 electrons, its energy level is complete with 2 valence electrons making it a stable element.

Multiple Choice

Which is the correct molecular structure for carbon dioxide?

Multiple Choice

What is the correct Lewis Dot Structure for ammonia NH3

Multiple Choice

How many bonds will N and P share?

• 1
• 2
• 3
• 4

Multiple Choice

How many bonds will S and P share?

• 1
• 2
• 3
• 4

Multiple Choice

Which of the elements in the picture has correct electron dot notation?

• 1

• 2

• 3

• 4

Multiple Choice

How many valence electrons does Sodium have

• 1
• 8
• 7
• 3