Molecular orbital theory

• What Is the MO Diagram for the Allyl Cation?
  The allyl cation has three π molecular orbitals and two π electrons, which occupy the lowest-energy bonding orbital.
• Why Do Alkaline Earth Metals Usually Melt at Higher Temperatures?
  Alkaline earth metals usually melt hotter than neighboring alkali metals, but band filling alone cannot explain the trend or predict melting points.