protactinium
Uranium's periodic neighbor
Protactinium is a radioactive metallic element with atomic number 91, occurring naturally in uranium ores in trace amounts.
It is one of the rarest and most expensive naturally occurring elements, with few practical applications outside scientific research.
The name reflects that it decays into actinium, with the prefix indicating it comes before actinium in the radioactive decay chain.
Heavy radioactive metal series
- radioactiveEmitting nuclear decay particles
- atomicOf elemental particles
- uraniumElement ninety-two
- thoriumActinide, atomic number ninety
periodic table · nuclear · isotope · metal · fissile · decay · alpha · half-life
Specific past year
- CranstonRhode Island municipality
- isolationComplete separation from others
- identificationEstablishing who someone is
- pitchblendePrimary uranium ore
radiochemistry · emanation · uranium-235 · historical · scientific discovery
Controlled fission apparatus
- fissionNuclear breakup releasing energy
- breedingReproductive cultivation of organisms
- chain reactionSelf-sustaining causal sequence
- criticalityState of utmost importance
transmutation · irradiation · nuclear waste · nuclear physics · Manhattan Project
Minute remnant or pursue
- rare earthMetallic elements, often mined together
- pitchblendePrimary uranium ore
- extractionAct of removing
- separationState of being apart
purification · microgram · geological · primordial · mineral deposits
actinide
Heavy radioactive metal series
- radioactiveEmitting nuclear decay particles
- atomicOf elemental particles
- uraniumElement ninety-two
thorium · periodic table · nuclear · isotope · metal · fissile · decay · alpha · half-life · electron
1913
Specific past year
- CranstonRhode Island municipality
- isolationComplete separation from others
- identificationEstablishing who someone is
pitchblende · radiochemistry · emanation · uranium-235 · historical · scientific discovery
reactor
Controlled fission apparatus
- fissionNuclear breakup releasing energy
- breedingReproductive cultivation of organisms
- chain reactionSelf-sustaining causal sequence
criticality · transmutation · irradiation · nuclear waste · nuclear physics · Manhattan Project
trace
Minute remnant or pursue
- rare earthMetallic elements, often mined together
- pitchblendePrimary uranium ore
- extractionAct of removing
separation · purification · microgram · geological · primordial · mineral deposits