CAS: 7440-09-7 EC No: 231-119-8 MDL No: MFCD00133776 RTECS: TS6460000 UN No: UN2257; Haz Class: 4.3; Packing Group: I Solid, sealed in ampules under vacuum Molecular Formula: K MW: 39.10 Melting Point: 64° Boiling Point: 760° Density (g/mL): 0.86