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Formulae of substancesMetals
Group I Group II Group IIIElement Ion Element Ion Element Ion
LiLithium atom
Li+
Lithium ionBe
Beryllium atom
Be2+
Beryllium ion
NaSodium atom
Na+
Sodium ionMg
Magnesium atom
Mg2+
Magnesium ion
AlAluminium
atom
Al3+
Aluminium ion
KPotassium
atom
K+
Potassium ionCa
Calcium atomCa2+
Calcium ion
RbRubidium
atom
Rb+
Rubidium ionSr
Strontium atom
Sr2+
Strontium ion
CsCaesium
atom
Cs+
Potassium ionBa
Bariumatom
Ba2+
Barium ion
Transition Metals Some Polyatomic IonsElement Ion Ion
AgSilver atom
Ag+
Silver ionNH4
+
Ammonium ion
CuCopper atom
Cu+
Copper (I) ionOH-
Hydroxide ion
Cu2+
Copper (II) ionCO3
2-
Carbonate ion
ZnZinc atom
Zn2+
Zinc ion
PbLead atom
Pb2+
Lead (II) ion
FeIron atom
Fe2+
Iron (II) ionFe3+
Iron (III) ion
Prepared by Lin XJ 1
Secondary 3 NA Science (Chemistry)Chapter 7: Writing EquationsReference Notes
Non- Metals
Group VElement Ion Molecule Others
NNitrogen atom
N3-
Nitride ionN2
Nitrogen moleculeNO2
-
Nitrite ion
NO3-
Nitrate ion
PPhosphorous atom
P3-
Phosphide ionP4
Phosphorous molecule
PO43-
Phosphate ion
Group VIElement Ion Molecule Others
OOxygen atom
O2-
Oxide ionO2
Oxygen molecule
SSulfur atom
S2-
Sulfide ionS8
Sulfur molecule(usually written as S
only)
SO32-
Sulfite ion
SO42-
Sulfate ion
Group VIIElement Ion Molecule
FFluorine atom
F-
Fluoride ionF2
Fluorine molecule
ClChlorine atom
Cl-
Chloride ionCl2
Chlorine molecule
BrBromine atom
Br-
Bromide ionBr2
Bromine molecule
IIodine atom
I-
Iodide ionI2
Iodine molecule
Formulae of some other covalent molecules
Covalent Compounds
Chemical Formulae Covalent Compounds
Chemical Formulae
Hydrogen H2 Carbon dioxide CO2
Ozone O3 Carbon monoxide COMethane CH4 Sulphur dioxide SO2
Ammonia NH3 Nitrogen dioxide NO2
Prepared by Lin XJ 2
1. Common Acids:(a) Hydrochloric Acid, HCl (b) Sulphuric Acid, H2SO4
(c) Nitric Acid, HNO3
2. Common Alkalis:(a) Sodium hydroxide, NaOH(b) Potassium hydroxide, KOH(c) Calcium hydroxide, Ca(OH)2
(d) Barium hydroxide, Ba(OH)2
(e) Ammonium hydroxide, NH4OH
Water H2O Hydrogen peroxide H2O2
Prepared by Lin XJ 3