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A '''compound''' is a [[molecule]] which is composed of more than one ''element''.
A '''compound''' is a [[molecule]] which is composed of more than one ''element''.
<ref>A compound is a substance with a fixed ratio of elements which determines the composition, and a particular organization which determines chemical properties. [http://www.newworldencyclopedia.org/entry/Chemical#Compounds New World Encyclopedia] </ref>
Chemical compounds can be fairly simple, such as water (H<sub>2</sub>O), which is just one [[oxygen]] atom and two [[hydrogen]] atoms. Many are moderately complex, like sugars, which consist of no more than a few dozen [[carbon]], oxygen, and hydrogen atoms, e.g. C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>. Some are relatively huge (still not visible to the naked eye), such as DNA, which can contain millions of atoms in one double helix crystal.
Chemical compounds can be fairly simple, such as water (H<sub>2</sub>O), which is just one [[oxygen]] atom and two [[hydrogen]] atoms. Many are moderately complex, like sugars, which consist of no more than a few dozen [[carbon]], oxygen, and hydrogen atoms, e.g. C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>. Some are relatively huge (still not visible to the naked eye), such as DNA, which can contain millions of atoms in one double helix crystal.