Default:He, Ne, Ar, Kr, Xe, Rd

Molecules: 0 bond is accepted.

• Exceptions: The following xenon compounds are accepted: XeF₂, XeF₄, XeF₆, XeO₃, XeO₄ XeOF₄, XeO₂F₂, XeO₃F₂.

Ions: 0 charge is accepted

Radicals: 0 radical is accepted