Search on: HYDROGEN 
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Descriptor English:   Hydrogen 
Descriptor Spanish:   Hidrógeno 
Descriptor Portuguese:   Hidrogênio 
Synonyms English:   Hydrogen 1
Tree Number:   D01.268.406
Definition English:   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. 
Indexing Annotation English:   H or H1; H2 or 2H (superscript) = DEUTERIUM; H2 (subscript) = HYDROGEN; H3 or 3H = TRITIUM; production of H ions = probably PH
Allowable Qualifiers English:  
AD administration & dosage AE adverse effects
AG agonists AN analysis
BL blood CF cerebrospinal fluid
CH chemistry CL classification
DF deficiency EC economics
HI history IM immunology
IP isolation & purification ME metabolism
PK pharmacokinetics PD pharmacology
PH physiology PO poisoning
RE radiation effects ST standards
SD supply & distribution TU therapeutic use
TO toxicity UR urine
Record Number:   7012 
Unique Identifier:   D006859 

Occurrence in VHL: