Protaktinium
91
Pa
Groep
n/a
Periode
7
Blok
f
Protrone
Elektrone
Neutrone
91
91
140
Algemene Eienskappe
Atoom Nommer
91
Atoommassa
231,03588
Massa Nommer
231
Kategorie
Aktiniede
Kleur
Silver
Radioaktief
Ja
From the Greek protos meaning first
Kristalstruktuur
Centered Tetragonal
Geskiendenis
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.
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.
Elektrone per skil
2, 8, 18, 32, 20, 9, 2
Elektronkonfigurasie
[Rn] 5f2 6d1 7s2
Protactinium is one of the rarest and most expensive naturally occurring elements
Fisiese Eienskappe
Fase
Soliede
Digtheid
15,37 g/cm3
Smeltpunt
1841,15 K | 1568 °C | 2854,4 °F
Kookpunt
4300,15 K | 4027 °C | 7280,6 °F
Heat of Fusion
15 kJ/mol
Heat of Vaporization
470 kJ/mol
Spesifieke Hitte Kapasiteit
-
Oorvloed in die aardkors
9,9×10-13%
Oorvloed in die heelal
n/a
CAS Nommer
7440-13-3
PubChem CID Nommer
n/a
Atomiese Eienskappe
Atoom radius
163 pm
Kovalente Radius
200 pm
Elektronegatiewiteit
1,5 (Pauling scale)
Ionisasie potensiaal
5,89 eV
Atoom volume
15,0 cm3/mol
Termiese geleidingsvermoë
0,47 W/cm·K
Oksidasiestate
3, 4, 5
Toepassings
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.
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
Isotope
Stabiele Isotope
-Onstabiele Isotope
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