1. Day 8 Ionic Bonds ct’d
Science 10

2. Ionic bonds form Ionic compounds
Form between positive & negative ions
Electrical attraction due to opposite charges
Occurs due to a transfer of electrons from the metal to the non-metal
Metal + non-metal (cation + anion)

3. Li Cl Li+ + Cl - LiCl Ionic bonds Li will lose 1 e- Cl needs 1 e-
The ionic compound formed is LiCl (lithium chloride) *we will do more on this later
Li Cl
Li+ + Cl LiCl 1+ 1-
All compounds must be neutral (charges must add up to zero)

4. Mg Cl Cl Mg2+ + Cl - + Cl - MgCl2 Ionic bonds -Mg will lose 2 e-
-Cl only needs 1, so we need 2 Cl-
The ionic compound formed is MgCl2 (magnesium chloride)
Mg Cl Cl
Mg2+ + Cl - + Cl MgCl2
2- (1- x 2) 2+
All compounds must be neutral (charges must add up to zero)

5. Practice For each pair of elements draw the Lewis structure
add arrows to show the electron transfer (the bond)
write the formula for the ionic compound.
Li and F Be and O Al and N Sr and P
Mg and Br Na and Se Ba and As K and O
Tl and Cl Ga and S
sulfur and magnesium oxygen and cesium
chlorine et indium radium and nitrogen