Prometium

61
Pm
Golongan
n/a
Periode
6
Blok
f
Proton
Elektron
Neutron
61
61
84
Sifat Umum
Nomor atom
61
Massa atom
[145]
Nomor massa
145
Kategori
Lantanida
Warna
Perak
Radioaktif
Ya
Named after the Greek Prometheus, who, according to mythology, stole fire from heaven
Struktur kristal
n/a
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.
Elektron per kulit
2, 8, 18, 23, 8, 2
Konfigurasi elektron
[Xe] 4f5 6s2
Pm
Promethium is the only lanthanide that has no stable isotopes
Sifat Fisika
Fase
Solid
Kepadatan
7,26 g/cm3
Titik lebur
1315,15 K | 1042 °C | 1907,6 °F
Titik didih
3273,15 K | 3000 °C | 5432 °F
Kalor peleburan
7,7 kJ/mol
Kalor penguapan
290 kJ/mol
Kapasitas kalor molar
-
Kelimpahan di kerak bumi
n/a
Kelimpahan di alam semesta
n/a
Pitchblende,
Kredit Gambar: Wikimedia Commons (Geomartin)
Pitchblende, a uranium ore and the host for most of Earth's promethium
Nomor CAS
7440-12-2
PubChem CID Number
n/a
Sifat Atom
Jari-jari atom
183 pm
Jari-jari kovalen
199 pm
Elektronegativitas
-
Potensi Ionisasi
5,582 eV
Volume atom
22,39 cm3/mol
Kondusivitas termal
0,179 W/cm·K
Bilangan oksidasi
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