Name: ___________________________ ( ) Class:_______Date: ________

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