Protaktinio
91
Pa
Grupo
Neniu
Perio
7
Bloko
f
Protonoj
Elektronoj
Neŭtronoj
91
91
140
Ĝeneralaj Propraĵoj
Atoma Nombro
91
Atommaso
231,03588
Amasa Nombro
231
Kategorio
Aktinoidoj
Koloro
Arĝento
Radioaktiva
Jes
From the Greek protos meaning first
Kristala Strukturo
Centrita Kvarlatero
Historio
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.
Elektronoj per ŝelo
2, 8, 18, 32, 20, 9, 2
Elektrona Agordo
[Rn] 5f2 6d1 7s2
Protactinium is one of the rarest and most expensive naturally occurring elements
Fizikaj Propraĵoj
Fazo
Solido
Denso
15,37 g/cm3
Fandpunkto
1841,15 K | 1568 °C | 2854,4 °F
Bolpunkto
4300,15 K | 4027 °C | 7280,6 °F
Varmo de Fuzio
15 kJ/mol
Varmo de Vaporiĝo
470 kJ/mol
Specifa Varmo Kapacito
-
Krusta Abundo
9,9×10-13%
Universa Abundo
Neniu
CAS Nombro
7440-13-3
PubChem Kunmetita Identiga Nombro
Neniu
Atomaj Propraĵoj
Atoma Radiuso
163 pm
Kovalenta Radiuso
200 pm
Elektronegativeco
1,5 (Pauling-skalo)
Potencialo de jonigo
5,89 eV
Atoma Volumo
15,0 cm3/mol
Termika Kondukto
0,47 W/cm·K
Oksidaj Ŝtatoj
3, 4, 5
Aplikoj
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
Izotopoj
Stabilaj Izotopoj
-Malstabilaj Isotopoj
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