Promethium

61
Pm
Kumpulan
Tiada
Kala
6
Blok
f
Proton
Elektron
Neutron
61
61
84
Ciri-Ciri Am
Nombor atom
61
Berat atom
[145]
Nombor jisim
145
Kategori
Lantanid
Warna
Perak
Radioaktif
Ya
Named after the Greek Prometheus, who, according to mythology, stole fire from heaven
Struktur hablur
Tiada
Sejarah
The existence of an element between neodymium and samarium was first predicted by Czech chemist Bohuslav Brauner in 1902.

Promethium was first produced and characterized at Oak Ridge National Laboratory in 1945 by Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. Coryell.

It was produced by the separation and analysis of the fission products of uranium fuel irradiated in a graphite reactor.
Bilangan elektron per petala
2, 8, 18, 23, 8, 2
Konfigurasi elektron
[Xe] 4f5 6s2
Pm
Promethium is the only lanthanide that has no stable isotopes
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
7.26 g/cm3
Takat lebur
1315.15 K | 1042 °C | 1907.6 °F
Takat didih
3273.15 K | 3000 °C | 5432 °F
Haba pelakuran
7.7 kJ/mol
Haba pengewapan
290 kJ/mol
Muatan haba molar
-
Banyak pada kerak bumi
Tiada
Banyak pada alam semesta
Tiada
Pitchblende,
Kredit imej: Wikimedia Commons (Geomartin)
Pitchblende, a uranium ore and the host for most of Earth's promethium
Nombor CAS
7440-12-2
PubChem CID Number
Tiada
Ciri-Ciri Atom
Jejari atom
183 pm
Jejari kovalen
199 pm
Keelektronegatifan
-
Kebolehan mengion
5.582 eV
Isipadu atom
22.39 cm3/mol
Daya pengaliran terma
0.179 W/cm·K
Keadaan pengoksidaan
3
Aplikasi
Promethium is also used in atomic batteries for spacecraft and guided missiles.

Promethium is also used to measure the thickness of materials by evaluating the amount of radiation from a promethium source that passes through the sample.

It has possible future uses in portable X-ray sources, and as auxiliary heat or power sources for space probes and satellites.
Promethium is harmful due to its radioactivity
Isotop
Isotop stabil
-
Isotop tidak stabil
126Pm, 127Pm, 128Pm, 129Pm, 130Pm, 131Pm, 132Pm, 133Pm, 134Pm, 135Pm, 136Pm, 137Pm, 138Pm, 139Pm, 140Pm, 141Pm, 142Pm, 143Pm, 144Pm, 145Pm, 146Pm, 147Pm, 148Pm, 149Pm, 150Pm, 151Pm, 152Pm, 153Pm, 154Pm, 155Pm, 156Pm, 157Pm, 158Pm, 159Pm, 160Pm, 161Pm, 162Pm, 163Pm