| Eegenskapen |
|---|
|
| Algemian |
|---|
| Nööm, Symbool, Numer | Protaktiinium, Pa, 91 |
| Seerie | Aktinoid |
| Skööl, Periode, Blook | Ac,7, f |
| Klöör, Skak | salwern, metalen |
| CAS-Numer | 7440-13-3 |
| Uundial | 9 · 10−8 ppm[1] |
| Atomaar[2] |
|---|
| Atoommase | 231,03588(2)[3]u |
| Atoomraadius (bereegent) | 180 ()pm |
| Kovalent-Raadius | 200 pm |
| Elektroonen | [Rn] 5f2 6d1 7s2 |
| 1. Ionisiarang | 568kJ/mol |
| Füsikaalisk[2] |
|---|
| Tustant | fääst |
| Kristal | tetragonaal |
| Sachthaid | 15,37 g/cm3 |
| Smoltponkt | 1841K (1568 °C) |
| Molaar Rüm | 15,18 · 10−6 m3/mol |
| Dampwaremk | 470 kJ/mol kJ/mol |
| Smoltwaremk | 15 kJ/mol |
| Elektrisk struumfeerang | 5,56 · 106 A/(V · m) |
| Waremkfeerang | 47W/(m · K) |
| Cheemisk[2] |
|---|
| Oksidatsionstustant | 5 |
| Sür ofbaasisk | swaakbaasisk |
| Elektronegatiwiteet | 1,5 (Pauling-Skala) |
| Isotoopen |
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| Isotoop | NH | t1/2 | Aktiwiteet | Energii (MeV) | Produkt |
|---|
| 229Pa | {syn.} | 1,50d | ε | 0,316 | 229Th | | α | 5,841 | 225Ac | | 230Pa | {syn.} | 17,4d | ε | 1,310 | 230Th | | β− | 0,563 | 230U | | α | 5,439 | 226Ac | | 231Pa | 100 % | 32760a | α | 5,149 | 227Ac | | 232Pa | {syn.} | 1,31d | β− | 1,337 | 232U | | ε | 0,495 | 232Th | | 233Pa | {syn.} | 26,967d | β− | 0,571 | 233U | | 234Pa | ferenkelt | 6,70h | β− | 2,197 | 234U | | 234mPa | ferenkelt | 1,17min | β− | 2,271 | 234U | | IT | 0,074 | 234Pa |
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| Muar isotoopen biList faan isotoopen |
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| Seekerhaid |
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| Muar wäärnangen |
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| Radioaktiif |
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 Radioaktiif
Radioaktiif element |
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| Miast wurdSI-ianhaiden brükt. |
