14th Group

    Carbon (C), Silicon (Si), Germanium (Ge)

    • Default: CH4, SiH4, GeH4 respectively.

    • Molecules:

      • Neutral atoms Implicit Hydrogens are added to have 4 bonds. 5 or more bonds are forbidden.

      • Charged atoms: Every added charge on these atoms (no matter it is positive or negative) decreases by one the number of possible bonds. Maximum charge accepted is ±4.

      • Radical: Every added radical on these atoms decreases by one the number accepted of bonds.

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

    Tin (Sn)

    • Default: Sn

    • Molecules:

      • Neutral atoms: Implicit Hydrogens are added to have 4 bonds (if Tin has at least 1 bond). 5 or 6 bonds are also accepted.

      • Charged atoms:

        • Positive charge: Every added charge (no matter it is positive or negative) decreases by one the number of possible bonds. Maximum charge accepted is +4.

        • Negative charge: Not allowed.

      • Radical: Every added radical on these atoms decreases by one the number accepted of bonds.

    • Ions:

      • Sn2+ and Sn4+ are accepted.
    • Other:

      • Sn with 2 electrons in bonds and with at least to coordinate bonds are accepted.

    Lead (Pb)

    • Default: Pb

    • Molecules:

      • Neutral atom:

        • 1 or 2 bonds: 1 or 0 implicit hydrogen is added, respectively.

        • 3 or 4 bonds: 1 or 0 implicit hydrogen is added, respectively.

        • 5 or 6 bonds are accepted.

        • More than 6 bonds are forbidden.

      • Charged atom:

        • Positive charge: Every added charge (no matter it is positive or negative) decreases by one the number of possible bonds. Maximum charge accepted is +4.

        • Negative charge: Not allowed.

      • Radical: Every added radical on these atoms decreases by one the number accepted of bonds.

    • Ions:

      • Pb2+ and Pb4+ are accepted.