Protaktinium

91
Pa
Kumpulan
Tiada
Kala
7
Blok
f
Proton
Elektron
Neutron
91
91
140
Ciri-Ciri Am
Nombor atom
91
Berat atom
231.03588
Nombor jisim
231
Kategori
Aktinid
Warna
Perak
Radioaktif
Ya
From the Greek protos meaning first
Struktur hablur
Pusat Tetragonal
Sejarah
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.
Bilangan elektron per petala
2, 8, 18, 32, 20, 9, 2
Konfigurasi elektron
[Rn] 5f2 6d1 7s2
Pa
Protactinium is one of the rarest and most expensive naturally occurring elements
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
15.37 g/cm3
Takat lebur
1841.15 K | 1568 °C | 2854.4 °F
Takat didih
4300.15 K | 4027 °C | 7280.6 °F
Haba pelakuran
15 kJ/mol
Haba pengewapan
470 kJ/mol
Muatan haba molar
-
Banyak pada kerak bumi
9.9×10-13%
Banyak pada alam semesta
Tiada
Illustration
Kredit imej: Images-of-elements
Illustration of protactinium
Nombor CAS
7440-13-3
PubChem CID Number
Tiada
Ciri-Ciri Atom
Jejari atom
163 pm
Jejari kovalen
200 pm
Keelektronegatifan
1.5 (Skala Pauling)
Kebolehan mengion
5.89 eV
Isipadu atom
15.0 cm3/mol
Daya pengaliran terma
0.47 W/cm·K
Keadaan pengoksidaan
3, 4, 5
Aplikasi
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
Isotop
Isotop stabil
-
Isotop tidak stabil
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