Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted. The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov. Updates regarding government operating status and resumption of normal operations can be found at opm.gov.

NLM Logo

Protactinium MeSH Descriptor Data 2026


MeSH Heading
Protactinium
Tree Number(s)
D01.268.271.100.725
D01.268.556.750
D01.496.749.305.100.725
D01.552.020.778
D01.552.544.750
Unique ID
D011478
RDF Unique Identifier
http://id.nlm.nih.gov/mesh/D011478
Scope Note
A radioactive element of the actinide group of metals. It has the atomic symbol Pa, atomic number 91, and atomic weight 231. It decays by alpha-emission.
Registry Numbers
0S6855V29M
Related Numbers
7440-13-3
CAS Type 1 Name
Protactinium
Date Introduced
1966/01/01
Last Updated
2017/04/25
Protactinium Preferred
page delivered in 0.156s