Hydrogen Information

Chinese Name: Pure Hydrogen (99.99%); Liquid Hydrogen; High-Purity Hydrogen; Compressed Hydrogen Gas
English Name: Hydrogen
English Aliases: Compressed Hydrogen; Molecular Hydrogen

CAS Number: 1333-74-0
EINECS Number: 215-605-7
Molecular Formula: H₂
Molecular Weight: 2.0157

Isotopes

• Naturally Occurring Isotopes:
  
  • H¹ (Protium, 氕)
  
  
  • H² (Deuterium, 氘 , Heavy Hydrogen)
  
  
  • H³ (Tritium, 氚 , Superheavy Hydrogen)
  
  


• Artificially Synthesized Isotopes: Hydrogen-4, Hydrogen-5, Hydrogen-6, Hydrogen-7

Hydrogen is the earliest formed element, accounting for approximately 90% of the universe's elemental abundance. However, it rarely exists as elemental hydrogen gas (H₂) in nature.

Safety Precautions

• Deuterium (Heavy Hydrogen): Non-toxic but has asphyxiating properties.


• Hydrogen Gas: Highly flammable and explosive. If combustion produces a loud popping sound, it indicates impure hydrogen. It is extremely prone to explosions.

Due to these risks, sufficient attention must be given to its handling. For additional details, refer to hydrogen-related safety guidelines.