User guide

Isotopes can be included anywhere that regular elements can.
Deuterium and Tritium appear as one-letter symbols.
Radicals
Radicals are indicated with the appropriate symbol from the Chemical Symbols palette. As with charges, they are
assigned to the nearest atom. Radicals always occupy one free valence, in addition to any charge effects. Two exam-
ples are:
Note: The lone pair symbol is interpreted as a diradical when it is placed next to an unlabeled carbon atom.
H-Dot/H-Dash
H-Dot and H-Dash symbols from the Chemical Symbols palette indicate the stereochemistry of a single hydrogen
atom. These symbols are most common in fused systems, such as below:
Complexes
Compounds with electron pairs can act as Lewis bases, bonding with Lewis acids that are electron-deficient. Similar
behavior can be seen between lone pairs and metals.
The best representation of these types of interaction is with a dative bond from the electron-pair donor to the acceptor.
With a plain bond instead of the dative bond, will cause a valence error. The dative bond more accurately represents
the electron donation.
Complexes may also be represented with explicit lone pairs and without any bonds.
If you use a simple bond to indicate a complex, you may want to set Abnormal Valence to Allowed in the Atom Prop-
erties dialog.
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