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Radium

   

 
Radium
Symbol: Ra
Number: 88
Element category: Alkaline earth metal
CAS number: 7440-14-4
Standart atomic weight: 226,0254
Density: 5,5 g/cm3
Hardness : - - -
Melting point: 700°C (1292°F)
Boiling point: 1737°C (3158.6°F)

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Vintage Radium Paint Watch Hands
Vintage Radium Paint Watch Hands

These dials (Zinc Sulfide ZnS with some Radium226 Sulphate) were lastly produced in the 1970’s. ..