SNC 1D
Chemical Bonds – Ionic Bonds
1. Identify the Number of Valance Electrons and Draw the Lewis Dot Structure
Notes: Scientists use Lewis Dot Structures to show the valance electrons of an element as dots.
Since bonding involves the valance shell electrons only, it is only necessary to illustrate those outer
electrons.
Element
#of valence electrons
Tendency to lose or
gain
Calcium
2
lose (2)
Chlorine
7
gain (1)
Lewis Dot Structure
Magnesium
Mg
Sulfur
S
Lithium
Li
Oxygen
O
Aluminum
Al
Iodine
I
2. Draw the formation of the ionic compounds using Lewis Dot Diagrams for the following pairs of
elements. The first example is done for you.
1. Calcium and Chlorine
→
2. Magnesium and Sulfur
3. Lithium and Oxygen
4. Aluminum and Iodine