โ–ธโ–ธ
  • ๐Ÿ‡ฌ๐Ÿ‡ง Protactinium
  • ๐Ÿ‡จ๐Ÿ‡ณ ้ท
  • ๐Ÿ‡ณ๐Ÿ‡ฑ Protactinium
  • ๐Ÿ‡ซ๐Ÿ‡ท Protactinium
  • ๐Ÿ‡ฉ๐Ÿ‡ช Protactinium
  • ๐Ÿ‡ฎ๐Ÿ‡ฑ ืคืจื•ื˜ืงื˜ื™ื ื™ื•ื
  • ๐Ÿ‡ฎ๐Ÿ‡น Protoattinio
  • ๐Ÿ‡ฏ๐Ÿ‡ต ใƒ—ใƒญใƒˆใ‚ขใ‚ฏใƒใƒ‹ใ‚ฆใƒ 
  • ๐Ÿ‡ต๐Ÿ‡น Protactínio
  • ๐Ÿ‡ท๐Ÿ‡บ ะŸั€ะพั‚ะฐะบั‚ะธะฝะธะน
  • ๐Ÿ‡ช๐Ÿ‡ธ Protactinio
  • ๐Ÿ‡ธ๐Ÿ‡ช Protaktinium

Protactinium: the essentials

Protactinium atoms have 91 electrons and the shell structure is 2.8.18.32.20.9.2. The ground state electronic configuration of neutral protactinium is [Rn].5f2.6d1.7s2 and the term symbol of protactinium is 4K11/2.

Protactinium: description  

Protactinium has a bright metallic lustre which it retains for some time in air. The element is superconductive below 1.4 K. The element is a dangerous toxic material and requires precautions similar to those used when handling plutonium. Protactinium is one of the rarest and most expensive naturally occurring elements. The element is an α-emitter and is a radiological hazard similar to polonium. 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.

protactinium
This sample of uraninite contains some about 10-6 grammes of actinium at any one time. Image adapted with permission from Prof James Marshall's (U. North Texas, USA) Walking Tour of the elements CD.

Protactinium: physical properties

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Protactinium: heat properties

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Protactinium: atom sizes

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Protactinium: electronegativities

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Protactinium: orbital properties

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Protactinium: abundances

More geological data...

Protactinium: crystal structure

Pa crystal structure
The solid state structure of protactinium is: bcc (body-centred cubic).

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Protactinium: biological data

Protactinium has no biological role.

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Protactinium: uses

Uses...

Protactinium: reactions

Reactions of protactinium as the element with air, water, halogens, acids, and bases where known.

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Protactinium: binary compounds

Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of protactinium where known.

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Protactinium: compound properties

Bond strengths; lattice energies of protactinium halides, hydrides, oxides (where known); and reduction potentials where known.

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Protactinium: history

Protactinium was discovered by Otto Hahn, Lise Meitner, Frederick Soddy, John Cranston in 1913 at Germany, England. Origin of name: from the Greek word "protos" meaning "first".

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Protactinium: isotopes

Isotope abundances of protactinium
Isotope abundances of protactinium with the most intense signal set to 100%.

More isotope and NMR data...

Protactinium: isolation

Isolation: coming soon!