Name: ____________________________ Hour: __________
Naming Compounds and Writing Formulas
Common Anions
Common Cations
Element Name: Ion Name: Ion Symbol: Ion Charge
Ion Name:
Symbol:
Ion Name:
Symbol:
Fluorine
Fluoride
F-
1-
Copper(I)
Cu+
Chromium(II)
Cr2+
Chlorine
Chloride
Cl-
1-
Copper(I)
Cu+
Chromium(II)
Cr2+
Bromine
Bromide
Br-
1-
Copper(II)
Cu2+
Chromium(III)
Cr3+
Iodine
Iodide
I-
1-
Iron(II)
Fe2+
Titanium(II)
Ti2+
Oxygen
Oxide
O2-
2-
Iron(III)
Fe3+
Titanium(III)
Ti3+
Sulfur
Sulfide
S2-
2-
Lead(II)
Pb2+
Titanium(IV)
Ti4+
Selenium
Selenide
Se2-
2-
Hydrogen
H+
Lithium
Li+
Tellurium
Telluride
Te2-
2-
Sodium
Na+
Potassium
K+
Nitrogen
Nitride
N3-
3-
Lead(IV)
Pb4+
Mercury(II)
Hg2+
Phosphorus
Phosphide
P3-
3-
Rubidium
Rb+
Cesium
Cs+
Arsenic
Arsenide
As3-
3-
Beryllium
Be2+
Magnesium
Mg2+
Calcium
Ca2+
Strontium
Sr2+
Barium
Ba2+
Radium
Ra2+
Nickel
Ni2+
Zinc
Zn2+
Aluminum
Al3+
Common Polyatomic Ions
Name:
Formula:
Ammonium NH4+
Name:
Formula:
Name:
Formula:
Acetate
C2H3O2-
Perchlorate
ClO4-
Hydroxide
OH-
Peroxide
O22-
Chlorate
ClO3-
Nitrate
NO3-
Permanganate
MnO4-
Chlorite
ClO2-
Nitrite
NO2-
Cyanide
CN-
Periodate
IO4-
Tartrate
C4H4O62-
Oxalate
C2O42-
Iodate
IO3-
Sulfate
SO42-
Hydrogen sulfate
HSO4-
Hypoiodite
IO-
Sulfite
SO32-
Thiosulfate
S2O32-
Bromate
BrO3-
Carbonate
CO32-
Hydrogen carbonate
HCO3-
Hypobramite
BrO-
Phosphate
PO43-
Hydrogen phosphate HPO42-
Hydrogen Sulfite
HSO3-
Phosphite
PO33-
Hexafluorosilicate
SiF62-
Hydrogen Oxalate HC2O4-
Chromate
CrO42-
Dichromate
Cr2O72-
Dihydrogen Phospate H2PO4-
Silicate
SIO32-
Hypochlorite
OCl-
Hydrogen Sulfide
HS-
Borate
BO33-
Tetraborate
B4O72-
Thiocyanate
SCN-
Writing Formulas for Ionic Compounds
1.
Place the symbol for the cation first, followed by the anion. List the symbols and charges for
the cation and anion.
2.
Use subscripts to show the ratio of the ions in the compound. The total charge on the cations
and anions must add up to zero. Use the cross over method:
Fe3+ O2+
3.
Write the formula
Fe2O3
Naming Molecular Compounds
1.
The name of the most metallic element appears first. The most metallic elements are further
to the left and nearest to the bottom on the periodic table.
2.
Use prefixes to describe the number of atoms of each element.
Writing Molecular Formulas
1.
Write the symbols for the elements in the order they appear in the name.
2.
The prefixes indicate the number of atoms of each element appear in the molecule. The
prefixes appear as subscripts in the formula.
3.
If there is no prefix for an element, there is only one atom of that element in the molecule.
OF2 = oxygen difluoride
N2O5 = dinitrogen pentoxide
Prefixes for Naming Compounds
Prefix:
Number of Atoms:
mono-
1
di-
2
tri-
3
tetra-
4
penta-
5
hexa-
6
hepta-
7
octa-
8
nona-
9
deca-
10