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→Aromaticity: Fixed a typo in SMILES string of benzene |
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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
# have no [[Formal_charge#:~:text=In%20chemistry%2C%20a%20formal%20charge,atoms%2C%20regardless%20of%20relative%20electronegativity.|formal charge]], and
# have the number of hydrogens attached implied by the SMILES valence model (typically their normal valence, but for N and P it is 3 or 5, and for S it is 2, 4 or 6), and
# are the normal [[isotope]]s, and
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