Covalent Bond

Lewis Electron Dot Structure

• Proposed by Gilbert Lewis

• 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

• Lewis electrons

• valence electrons

• octet electrons

Multiple Choice

How many valence electrons should an element have for it to be considered as a STABLE element?

• 2

• 10

• 6

• 8

Multiple Choice

This is a correct dot diagram for fluorine (F)

• true
• false

Multiple Choice

This could be the dot diagram of

• Mg

• Cl

• C

• O

Multiple Choice

This is a correct dot diagram for neon (Ne)

• true

• false

Multiple Select

Which of the following could NOT form an ionic compound? Check all that apply.

• Li⁺ and Cl^-

• F^- and O^2-

• Ba²⁺ and Ag⁺

• Mg²⁺ and S^2-

Multiple Choice

An ionic bond is the attraction between:

• oppositely charged ions

• similarly charged ions

• neutral ions

• neutral atoms

Multiple Choice

Topic: Ionic Bonding

Which of the following is the correct illustration of bond formation for Calcium and Bromine?

• A

• B

• C

Multiple Choice

• ionic

• covalent

• metallic

• acid

Multiple Choice

What is the basis of a metallic bond?

• the attraction of neutral metal atoms.
• the attraction between protons and neutrons.
• the attraction between positive metal ions and interlocking electrons.
• the attraction between positive metal ions and free floating electrons.

Multiple Choice

Why do metals conduct

• They are shiny
• The electrons are held tightly within the lattice
• The electrons are delocalised and able to move
• The electrons are shared between two metal ions

Multiple Choice

How many valence electrons are unpaired in this atom?

• 4

• 3

• 2

• 1

Multiple Choice

How many covalent bonds are in this compound of Ammonia?

• 4

• 3

• 2

• 1

Multiple Choice

Covalent bonds are usually formed between...

• A metal and a non-metal

• Two non-metals

• Two metals

We need to understand how and why covalent bonds are formed.

Open Ended

List as many non-metals as you can.

Multiple Choice

What is the correct Lewis Dot Structure for ammonia NH3