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.

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.