Chalcogen, Coplanar triangle 3-vertex, Fusion

• C-H-N-O
• C-Cl-H-N-O
• C-Cu-H-N-O
• C-H-N-Na-O
• C-H-K-N-O
• temperature for congruent melting
• chalcogen
• non-disordered
• transitional
• quaternary
• monoclinic
• orthorhombic
• triclinic
• hexagonal
• trigonal