Water is made out of two elements called
hydrogen and oxygen, which are both very
common in the universe.
H2 O - - > H + H + O
The smallest unit of an element is called an
atom. In water, 2 hydrogen atoms and one oxygen
atom combine to form one water molecule. This
water molecule is still very tiny. An ounce of
water is made up of a gigantic number of water
molecules--more than a trillion trillions of
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