Alevel Chemistry Formulae

helium

He

Neon

Ne

Argon

Ar

Krypton

Kr

Xenon

Xe

Radon

Rn

Hydrogen

H2

nitrogen

N2

oxygen

O2

fluorine

F2

chlorine

Cl2

bromine

Br2

iodine

I2

phosphorus

P4

sulfur

S8

magnesium

Mg

iron

Fe

sodium

Na

nickel

Ni

carbon dioxide

CO2

carbon monoxide

CO

nitrogen monoxide

NO

nitrogen dioxide

NO2

sulfur dioxide

SO2

sulfur trioxide

SO3

ammonia

NH3

methane

CH4

hydrogen sulfide

H2S

hydrochloric acid

HCl

sulfuric acid

H2SO4

nitric acid

HNO3

phosphoric acid

H3PO4

silicon dioxide

SiO2

lithium ion

Li+

sodium ion

Na+

potassium ion

K+

magnesium ion

Mg2+

calcium ion

Ca2+

barium ion

Ba2+

aluminium ion

Al3+

zinc (ii) ion

Zn2+

ammonium ion

NH4+

hydrogen ion

H+

fluoride

F-

chloride

Cl-

bromide

Br-

iodide

I-

oxide

O2-

sulfide

S2-

nitrate

NO3-

sulfate

SO42-

carbonate

CO32-

hydrogencarbonate

HCO3-

hydroxide

OH-

hydride

H-

phosphate

PO43-

nitride ion

N3-

strontium ion

Sr2+

selenide ion

Se2-

astatide

At-