13th 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.