Chalcogen, Fusion, O-Th

• H-O-P-Th
• H-O-S-Th
• O-P-Th
• H-N-O-Th
• temperature for congruent melting
• chalcogen
• radioactive
• actinoid
• disordered
• monoclinic
• tetragonal
• cubic
• orthorhombic
• triclinic