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The Language of Chemistry

Bonding "Arms"

The way in which atoms join together to form molecules depends on the number of bonding arms each atom has.

A hydrogen atom has one bonding arm (Bonding arm) while an oxygen atom has two bonding arms.

Hydrogen with bonding arm

A hydrogen atom has one bonding arm

Oxygen with bonding arm

An oxygen atom has two bonding arms

Rule : When atoms chemically combine to make molecules all of their bonding arms must be used.

When one oxygen atom joins its bonding arms with two hydrogen atoms, as shown below

Making a water molecule

a molecule of water is formed

A water molecule

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