What can you use protactinium for?
Currently, protactinium is usually extracted from used nuclear fuel. Due to its scarcity, high toxicity, and high radioactivity, protactinium has no current practical uses other than basic scientific research.
Is protactinium a metal?
Protactinium (formerly protoactinium) is a chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray actinide metal which readily reacts with oxygen, water vapor and inorganic acids.
How much does protactinium cost?
Protactinium is one of the rarest and most expensive naturally occurring elements. O.R.N.L. supplies promethium-231 at a cost of about $280/g….
| Atomic Number: | 91 |
|---|---|
| Atomic Symbol: | Pa |
| Atomic Weight: | 231.0359 |
| Electron Configuration: | [Rn]7s25f26d1 |
| Total Isotopes | 32 |
What are the dangers of protactinium?
Because protactinium is taken up in the body much more readily if inhaled rather than ingested, both exposure routes can be important. The major health concern is cancer resulting from the ionizing radiation emitted by protactinium deposited in the skeleton, liver, and kidneys.
Is protactinium poisonous?
Protactinium is harmful due to its radioactivity and is also toxic. Characteristics: Protactinium is a very rare shiny, silvery, highly radioactive metal that tarnishes slowly in air to the oxide. Almost all naturally occurring protactinium is the 231 isotope.
Is protactinium rare or common?
Found naturally only in trace quantities and seminal to alternate nuclear reactor fuels, protactinium is an extremely rare element that could reveal new trends among nearby actinide elements, including uranium.
At what temperature does uranium melt?
2,070°F (1,132°C)
Uranium/Melting point
What happens when uranium oxidizes?
In air, uranium metal oxidizes and becomes coated with a dark layer of uranium oxide. Uranium forms a variety of alloys and compounds with the most important oxidation states being uranium(IV) and uranium(VI), and their two corresponding oxides are, respectively, uranium dioxide, UO2 and uranium trioxide, UO3.
Does protactinium have a freezing point?
2,854°F (1,568°C)
Protactinium/Melting point
Where is protactinium commonly found?
uranium ores
Small amounts of protactinium are found naturally in uranium ores. It is also found in spent fuel rods from nuclear reactors, from which it is extracted.
Where is protactinium found in nature?
Protactinium is a highly toxic and radioactive rare earth metal that requires special handling. It is found in pitchblende and ores form Zaire and is one of the rarest and most expensive naturally occurring elements.
What is protactinium metal?
Protactinium metal is a dense, silvery-gray material with a bright metallic luster which it retains for some time in air but it does readily react with oxygen, water vapor and inorganic acids to form various compounds. In solid compounds protactinium is most stable in the oxidation state +5, but it also exists in the +4, +3 and +2 oxidation states.
What is the oxidation state of protactinium in solids?
Protactinium exists in two major oxidation states, +4 and +5, both in solids and solutions, and the +3 and +2 states were observed in some solid phases. As the electron configuration of the neutral atom is [Rn]5f 2 6d 1 7s 2, the +5 oxidation state corresponds to the low-energy (and thus favored) 5f 0 configuration.
How do you convert Protactinium oxides to hydroxides?
Protactinium oxides are basic; they easily convert to hydroxides and can form various salts, such as sulfates, phosphates, nitrates, etc. The nitrate is usually white but can be brown due to radiolytic decomposition. Heating the nitrate in air at 400 °C converts it to the white protactinium pentoxide.
What is the half life of protactinium 231 Pa?
Nearly all naturally occurring protactinium is 231 Pa with a half-life of 32,700 years. It is an alpha emitter and is formed by the decay of uranium-235, whereas the beta radiating protactinium-234 with a half-life of 6.74 hours is produced as a result of uranium-238 decay. Nearly all uranium-238…