Protaktiinium as en cheemisk element mä det ufkörtang Pa an det atoomnumer 91. Hat hiart tu a aktinoiden.
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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 |
568 kJ/mol |
Füsikaalisk [4] |
Tustant |
fääst |
Kristal |
tetragonaal |
Sachthaid |
15,37 g/cm3 |
Smoltponkt |
1841 K (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 |
47 W/(m · K) |
Cheemisk [5] |
Oksidatsionstustant |
5 |
Sür of baasisk |
swaak baasisk |
Elektronegatiwiteet |
1,5 (Pauling-Skala) |
Isotoopen |
Isotoop |
NH |
t1/2 |
Aktiwiteet |
Energii (MeV) |
Produkt |
229Pa |
{syn.}
| 1,50 d | ε | 0,316 | 229Th | α | 5,841 | 225Ac |
230Pa |
{syn.}
| 17,4 d | ε | 1,310 | 230Th | β− | 0,563 | 230U | α | 5,439 | 226Ac |
231Pa |
100 %
| 32760 a | α | 5,149 | 227Ac |
232Pa |
{syn.}
| 1,31 d | β− | 1,337 | 232U | ε | 0,495 | 232Th |
233Pa |
{syn.}
| 26,967 d | β− | 0,571 | 233U |
234Pa |
ferenkelt
| 6,70 h | β− | 2,197 | 234U |
234mPa |
ferenkelt
| 1,17 min | β− | 2,271 | 234U | IT | 0,074 | 234Pa |
|
Muar isotoopen bi List faan isotoopen |
Seekerhaid |
|
Muar wäärnangen |
Radioaktiif |
Radioaktiif Radioaktiif element |
Miast wurd SI-ianhaiden brükt. |
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