15th Group

    Nitrogen (N)

    • Default: NH3

    • Molecules:

      • Neutral atoms

        • Implicit hydrogens are added to have 3 bonds (if nitrogen has at least 1 bond).

          More than 3 bonds are forbidden.

          If nitrogen has 4 ligands, charge is not set, hence not accepted

          Pentavalent N is accepted in traditional form by default, but keep in mind that these forms are not correct. Use the "ylide" from of the N atom which satisfies the correct valence electron count:

          traditional form "ylide" form
          images/download/attachments/1806267/trad1.png images/download/attachments/1806267/octet1.png
          images/download/attachments/1806267/trad2.png images/download/attachments/1806267/octet2.png
          images/download/attachments/1806267/trad3.png images/download/attachments/1806267/octet3.png
          images/download/attachments/1806267/vc1t.png images/download/attachments/1806267/vc1y.png
        • It's possible to accept only the "ylide" form using the MoleculeGraph.setValenceCheckOptions() function.

      • Charged atoms in a molecule:

        • Positive charge:

          • 1+: 4 bonds needed (incluing implicit hydrogens)

          • 2+: 3 bonds needed (incluing implicit hydrogens)

          • 3+: 2 bonds needed (incluing implicit hydrogens)

          • 4+: 1 bonds needed (incluing implicit hydrogens)

          • 5+: 0 bonds needed (incluing implicit hydrogens)

          • 6+ or more: not allowed

        • Negative charge: Every added negative charge decreases by one the number of possible bonds. Maximum charge accepted is -3.

      • Radical: Every added radical on these atoms decreases by one the number of bonds. Maximum three added radical is allowed.

      • Aromatic compounds: Nitrogen may form aromatic bonds as well.

    Phosphorus (P), Arsenic (As), Antimony (Sb), Bismuth (Bi)

    • Default: PH3, AsH3, SbH3, Bi

    • Molecules:

      • Neutral atoms:

        • 1 bond: 2 implicit Hydrogens are added.

        • 2 bond: 1 implicit Hydrogen is added.

        • 3 bond: 0 implicit Hydrogen is added.

        • 4 bond: 1 implicit Hydrogen is added.

        • 5 bond: 0 implicit Hydrogen is added.

        • More than 5 bonds are forbidden

      • Charged atoms in a molecule:

        • Positive charge:

          • 1+: 4 bonds are necessary (including implicit Hydrogens).

          • 2+: 3 bond is necessary (including implicit Hydrogens).

          • 3+: 2 bond is allowed.

          • 4+: 1 bond is necessary (including implicit Hydrogens).

          • 5+: 0 bond is allowed.

          • 6+ or more: not allowed

        • Negative charge: Every added negative charge decreases by one the number of possible bonds. Maximum charge accepted is -3.

      • Radical: Every added radical on these atoms decreases by one the number of bonds. Maximum three added radicals are allowed.

      • Aromatic compounds: Phosphorus may form aromatic bonds as well.