14^th 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.