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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 (
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
a molecule of water is formed
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) while an oxygen atom has two bonding arms.
