Download My Extra Help Teacher

Teacher Notes
Name
Key
Class
Date
Ionic Compounds I
Background
For #1-12, instruct students to simply name the ions in the compound, using the –ide suffix on the
nonmetal. Remind them that ionic compounds do not use the Greek prefixes.
For #13-24, suggest that students write the formula with charge on top of the ion’s name. A simple way
to write the formula is the “criss-cross” method.
Mg+2
Cl-1
magnesium chloride
The formula is MgCl2. (One subscripts are understood.)
The final step in this method is to make sure the subscripts are expressed in their lowest ratio.
Zr+4
zirconium
O-2
oxide
The criss-cross method results in Zr2O4, but lowest ratio is ZrO2. In order for the number of electrons lost
by zirconium to equal the number of electrons gained by the oxygen, only one zirconium and two
oxygens are needed.
Students should know how to predict the charge on ions by periodic table group.
Key (Monatomic Ions)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
sodium chloride
aluminum fluoride
potassium oxide
silver chloride
barium iodide
rubidium sulfide
strontium fluoride
potassium bromide
zirconium oxide
yttrium fluoride
lithium nitride
sodium sulfide
25. potassium nitride, K3N
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
MgCl2
Li2O
CaBr2
ZnS
Na3N
Al2O3
CaS
CsI
MgO
K2S
RbF
BeO