Pm
Promethium is the only radioactive lanthanide with no stable isotopes.
የፊዚክስ ባህሪያት
| አቶሚክ | 145.0 u |
| ብዛት | 7.26 g/cm³ |
| የቀለም አማራጭ | 1315.0 K |
| የሙቀት መጠኑ፦ | 3273.0 K |
| ቅርጽ | Metallic |
| የክፍሉ ወቅት | ቀጥ ያለ |
የኬሚካል ባህሪያት
| ሴኮንዶች | 1.13 (ፒየር) |
| ፊደል ሠሌዳው፦ | 540.0 kJ/mol |
| ፊደል ሠሌዳው፦ | 12.45 kJ/mol |
| መተላለፊያ | +2, +3 |
የፊደል ቅርጽ ምርጫዎች
| የኤሌክትሮን ማስተካከያ | [Xe] 4f5 6s2 |
| አቶሚክ | 183.0 pm |
| ሬዲየስ | 199.0 pm |
| ቫን ዴር ዋልስ | 236.0 pm |
መከፈት
| የተገኘው በ | Charles D. Coryell, Jacob A. Marinsky, Lawrence E. Glendenin |
| የምርምር ዓመት | 1945 |
| ቦታ | Oak Ridge, Tennessee, USA |
| ስም፦ (_N) | Prometheus, the Titan of Greek mythology |
ስለ Promethium
Promethium is a radioactive rare earth metal first produced from uranium fission products in 1945. Trace amounts exist in nature from uranium decay. Promethium-147 emits beta radiation.
ፕሮግራሞች
Nuclear batteries, luminous paint, thickness gauges, and beta radiation sources.
ሐቅ
Promethium is named after Prometheus, the Titan who stole fire -- fitting for an element discovered in nuclear reactions.
ሴኮንዶች
| ብዛት | ብዛት | አራተኛ | ቋሚ |
| 145 | - | 17.7 years | አዎ |
| 147 | - | 2.6234 years | አዎ |
የኤሌክትሮን ማስተካከያ
[Xe] 4f5 6s2