13^th Group

Boron

• **Default: ** BH₃

• Molecules:

  • Neutral atoms:

    • Implicit Hydrogens are added to have 3 bonds.
    • 4 bonds are accepted with 1 negative charge on the boron atom.
    • 5 or more bonds are forbidden.

  • Charged atoms:

    • *Positive charge: * Every added charge decreases by one the number of possible bonds. Maximum charge accepted is +3.
    • Negative charge: BH₄^-, BH₃^2- BH₂^3- BH^4- and B^5- are accepted.
  • *Radicals: * Every added radical on these atoms decreases by one the number of necessary bonds.
  • Aromatic compounds: Boron may form aromatic bonds as well.
    

Aluminium (Al), Gallium (Ga), Indium (In), Thallium (Tl)

• Default: Al, Ga, In, Tl respectively.

• Molecules:

  • *Neutral Atoms: * 3 bonds around these atoms are accepted.

  • Charged atoms:

    • *Positive charge: * Every added charge decreases by one the number of possible bonds. Maximum charge accepted is +3.
    • Negative charge: 4- charge with 4 ligands is accepted.
  • *Radicals: * Every added radical on these atoms decreases by one the number of necessary bonds.

• Ions:

  • Al⁺, Ga⁺, In⁺, Rb⁺, Al³⁺, Ga³⁺, In³⁺, Rb³⁺ are accepted.

• Radical: · Me²⁺ and · ? Me · are allowed.