Name: Answer Key Period: ______ Date: __________ Core Chem odds for HW, evens for extra practice
Writing Formulas for Ionic Compounds
Directions: Use the Octet rule to determine what Ion the element below will form. Then write the compound when the cation and
anion combine.
Metal (cation)
Non-metal (anion)
Ionic Compound
1)
Lithium Li+
Oxygen O2-
Li2O
2)
Calcium Ca2+
Fluorine F-
CaF2
3)
Aluminum Al3+
Chlorine Cl-
AlCl3
4)
Strontium Sr2+
Sulfur S2-
SrS
5)
Barium Ba2+
Phosphorus P3-
Ba3P2
6)
Potassium K+
Nitrogen N3-
K3N
7)
Rubidium Rb+
Iodine I-
RbI
8)
Cesium Cs+
Bromine Br-
CsBr
9)
Aluminum Al3+
Sulfur S2-
Al2S3
10)
Beryllium Be2+
Nitrogen N3-
Be3N2
11)
Magnesium Mg2+
Oxygen O2-
MgO
12)
Magnesium Mg2+
Chlorine Cl-
MgCl2
13)
Sodium Na+
Bromine Br-
NaBr
14)
Potassium K+
Phosphorus P3-
K3P
15)
Cesium Cs+
Chlorine Cl-
CsCl
16)
Calcium Ca2+
Fluorine F-
CaF2
17)
Aluminum Al3+
Iodine I-
AlI3
18)
Barium Ba2+
Sulfur S2-
BaS
19)
Beryllium Be2+
Oxygen O2-
BeO
20)
Aluminum Al3+
Oxygen O2-
Al2O3
21)
Lithium Li+
Nitrogen N3-
Li3N
22)
Magnesium Mg2+
Phosphorus P3-
Mg3P2
23)
Potassium K+
Oxygen O2-
K2O
24)
Rubidium Rb+
Nitrogen N3-
Rb3N
25)
Sodium Na+
Oxygen O2-
Na2O
26)
Aluminum Al3+
Nitrogen N3-
AlN
27)
Calcium Ca2+
Nitrogen N3-
Ca3N2
