Abnormal Valence

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The Abnormal Valence property specifies whether selected atoms can have a valence other than normal. "Normal" valences for each element are defined in the Isotopes Table file in the ChemDraw Items folder.

NOTE: The Abnormal Valence atom property does not provide a visual indicator.

The Abnormal Valence options are described in the following table.

Option	Search Result
Not allowed	Default. Finds compounds where the selected atoms only have valences that are normal for that element. If necessary, hydrogen atoms are automatically added to or removed from the atom before transferring it to the chemical database. If the Check Structure When Copying to Clipboard or Exporting preference is turned on, an error message warns of abnormal valences.
Allowed	Finds compounds with the specific valence drawn.

NOTE: If Abnormal Valence is Allowed, any Invalid Valence messages for those atoms are ignored automatically by the Check Structure command.