History of the Universe eBook. 398 pages, 300 illustrations only $2.99
An can with two atoms to make the very important we call water.
Ball and stick model of water H2O
Water is an example of a compound, because it contains more than one kind of atom. The formula for water is H2O meaning there are two hydrogen atoms for each oxygen atom.
Water molecules are especially wonderful! They can do things which separate atoms never could. They will play a special part in our story because they have some extraordinary properties.
► expands when it freezes.
► Water molecules are .
► This stickiness gave shape to .
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