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Substance Name: Hydrogen
RN: 1333-74-0
UNII: 7YNJ3PO35Z
Note
- The first chemical element in the periodic table with atomic symbol H, and atomic number 1. Protium (atomic weight 1) is by far the most common hydrogen isotope. Hydrogen also exists as the stable isotope DEUTERIUM (atomic weight 2) and the radioactive isotope TRITIUM (atomic weight 3). Hydrogen forms into a diatomic molecule at room temperature and appears as a highly flammable colorless and odorless gas.
Molecular Formula
- H2
Molecular Weight
- 2.0159
Classification Code
- Simple Asphyxiant
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Links to Resources
NLM Resources (File Locators)
Regulatory Agencies (Superlist Locators)
Other Resources (Internet Locators)
Names and Synonyms
Name of Substance
- Hydrogen
MeSH Heading
- Hydrogen
Synonyms
- EINECS 215-605-7
- H
- HSDB 5026
- Hydrogen
- Hydrogen atoms
- Molecular hydrogen
- Protium
- UNII-7YNJ3PO35Z
Systematic Name
- Hydrogen
Superlist Names
- Hydrogen
- Hydrogen, compressed
- Hydrogen, compressed [UN1049] [Flammable gas]
- Hydrogen, refrigerated liquid (cryogenic liquid)
- Hydrogen, refrigerated liquid (cryogenic liquid) [UN1966] [Flammable gas]
- UN1049
- UN1966
Registry Numbers
CAS Registry Number
- 1333-74-0
FDA UNII
- 7YNJ3PO35Z
Other Registry Number
- 725200-57-7
System Generated Number
- 0001333740