Protactinium

91
Pa
Groep
n.v.t.
Periode
7
Blok
f
Protonen
Elektronen
Neutronen
91
91
140
Algemene Eigenschappen
Atoomnummer
91
Atomair gewicht
231,03588
Massa Getal
231
Categorie
Actiniden
Kleur
Zilver
Radioactief
Ja
From the Greek protos meaning first
Kristalstructuur
Gecentreerd Tetragonaal
Historie
In 1900, William Crookes isolated protactinium as an intensely radioactive material from uranium

Protactinium was first identified in 1913 by Kasimir Fajans and Oswald Helmuth Göhring in Germany.

A more stable isotope of protactinium was discovered in 1917 by Otto Hahn and Lise Meitner at the Kaiser Wilhelm Institute in Berlin.
Eletronen per schil
2, 8, 18, 32, 20, 9, 2
Electronconfiguratie
[Rn] 5f2 6d1 7s2
Pa
Protactinium is one of the rarest and most expensive naturally occurring elements
Fysieke Eigenschappen
Fase
Vast
Dichtheid
15,37 g/cm3
Smeltpunt
1841,15 K | 1568 °C | 2854,4 °F
Kookpunt
4300,15 K | 4027 °C | 7280,6 °F
Fusiewarmte
15 kJ/mol
Verdampingswarmte
470 kJ/mol
Specifieke Warmtecapaciteit
-
Overvloedig aanwezig in de aardkorst
9,9×10-13%
Overvloedig aanwezig in het universum
n.v.t.
Illustration
Verdiensten voor afbeeldingen: Images-of-elements
Illustration of protactinium
CAS-nummer
7440-13-3
PubChem CID nummer
n.v.t.
Atoomeigenschappen
Atoomstraal
163 pm
Covalentiestraal
200 pm
Electronegativiteit
1,5 (Pauling schaal)
Ionisatiepotentiaal
5,89 eV
Atoomvolume
15,0 cm3/mol
Thermische geleiding
0,47 W/cm·K
Oxidatietoestanden
3, 4, 5
Toepassingen
Owing to its scarcity, high radioactivity and high toxicity, there are currently no uses for protactinium outside of scientific research.

With the advent of highly sensitive mass spectrometers, an application of 231Pa as a tracer in geology and paleoceanography has become possible.

Protactinium-231 combined with the thorium-230 can be used to date marine sediments.
Protactinium is toxic and highly radioactive
Isotopen
Stabiele isotopen
-
Instabiele isotopen
212Pa, 213Pa, 214Pa, 215Pa, 216Pa, 217Pa, 218Pa, 219Pa, 220Pa, 221Pa, 222Pa, 223Pa, 224Pa, 225Pa, 226Pa, 227Pa, 228Pa, 229Pa, 230Pa, 231Pa, 232Pa, 233Pa, 234Pa, 235Pa, 236Pa, 237Pa, 238Pa, 239Pa, 240Pa