What is "huckel"

Hückel or Huckel may refer to:

• Debye–Hückel equation, in chemistry, a method of calculating activity coefficients
• Erich Hückel, German physicist and chemist
• Hückel method, a method for the determination of energies of molecular orbitals
  • Extended Hückel method, considers also sigma orbitals (whereas the original Hückel method only considers pi orbitals)
• Hückel's rule, a method of determining aromaticity in organic molecules