.

Atoms are the building blocks of matter.A molecule is a group of atoms.

Hydrogen

Hydrogen

Hydrogen

Carbon

Hydrogen

Carbon

Lithium

Lithium

Lithium Titanium

Lithium Titanium

Au for Gold

Au for GoldAg for silver

A number following the element refers to the quantity of those atoms. The number comes after the element. For example, H2O means two hydrogens and one Oxygen, H2O4S means two hydrogens, four oxygens

and one sulphur

The order in which the elements are written usually follows the rule developed by Edwin Hill in 1900. According to this rule, when you have Carbon it goes first, Hydrogen is second and the rest are in alphabetical order.

H

C

LiTi

Au

Ag

H

CLi

Ti

Au

Ag

H

C

LiTi

Au

Ag

H

C

LiTi

Au

Ag

H

C

LiTi

Au

Ag

H

C

LiTi

Au

Ag

H

C

LiTi

Au

Ag

H

C

LiTi

Au

Ag

H

CLi

Ti

Au

Ag

H

CLi

Ti

Au

Ag

H

CLi

Ti

Au

Ag

H

CLi

Ti

Au

Ag

H

CLi

Ti

AuAg

H

CLi

Ti

Au

Ag

H

CLi

Ti

Au

Ag

H

CLi Ti

AuAg

H

CLi

Ti

Au

Ag

HCLi

Ti

Au

Ag

HC

LiTi

Au

Ag

HC

Li

Ti

Au

Ag

HC

Li

Ti

Au

Ag