Difference between revisions of "Protactinium"
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== Description == | == Description == | ||
| − | A dense, radioactive, metallic element. Protactinium is a natural decay product of U238 and occurs as a constituent of uranium ores. As a metal, it is silvery, ductile and malleable. It is found primarily as an intermediate in breeder reactors. | + | A dense, radioactive, metallic element. Protactinium is one of the rarest and most expensive naturally occurring elements. It is an α-emitter and is a radiological hazard similar to polonium. Protactinium is a natural decay product of U238 and occurs as a constituent of uranium ores. As a metal, it is silvery, ductile and malleable. It is found primarily as an intermediate in breeder reactors. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Pa; protoactinium | Pa; protoactinium | ||
| + | == Risks == | ||
| + | * Highly toxic radioactive material. | ||
| + | * Dangerous by ingestion, inhalation and contact. | ||
| + | |||
| + | ==Physical and Chemical Properties== | ||
{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
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|- | |- | ||
! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| − | | 1560-1575 | + | | 1560-1575 C |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 15.37 | + | | 15.37 g/ml |
|- | |- | ||
! scope="row"| Molecular Weight | ! scope="row"| Molecular Weight | ||
| Line 25: | Line 30: | ||
|- | |- | ||
! scope="row"| Boiling Point | ! scope="row"| Boiling Point | ||
| − | | 4227 | + | | 4227 C |
|} | |} | ||
| − | + | ==Resources and Citations== | |
| − | == | + | * Web Elements: [https://www.webelements.com/protactinium/ link] |
| − | |||
| − | |||
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 14:53, 22 October 2022
Description
A dense, radioactive, metallic element. Protactinium is one of the rarest and most expensive naturally occurring elements. It is an α-emitter and is a radiological hazard similar to polonium. Protactinium is a natural decay product of U238 and occurs as a constituent of uranium ores. As a metal, it is silvery, ductile and malleable. It is found primarily as an intermediate in breeder reactors.
Synonyms and Related Terms
Pa; protoactinium
Risks
- Highly toxic radioactive material.
- Dangerous by ingestion, inhalation and contact.
Physical and Chemical Properties
| Composition | Pa (atomic no. 91) |
|---|---|
| CAS | 7440-13-3 |
| Melting Point | 1560-1575 C |
| Density | 15.37 g/ml |
| Molecular Weight | atomic wt = 231.0359 |
| Boiling Point | 4227 C |
Resources and Citations
- Web Elements: link