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== Description ==
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[[Atom]]s are represented by the standard abbreviation of the [[chemical element]]s, in square brackets, such as <code>[Au]</code> for [[gold]]. Brackets may be omitted in the common case of atoms which:
# are in the "organic subset" of [[boron|B]], [[carbon|C]], [[nitrogen|N]], [[oxygen|O]], [[phosphorus|P]], [[sulfur|S]], [[fluorine|F]], [[chlorine|Cl]], [[bromine|Br]], or [[iodine|I]], and
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