| Eegenskapen |
|---|
|
| Algemian |
|---|
| Nööm, Symbool, Numer | Promeetium, Pm, 61 |
| Seerie | Lantanoid |
| Skööl, Periode, Blook | La,6, f |
| Klöör, Skak | metalen |
| CAS-Numer | 7440-12-2 |
| Uundial | 1,5 · 10−15 ppm[1] |
| Atomaar[2] |
|---|
| Atoommase | (147Pm) 146,9151u |
| Atoomraadius (bereegent) | 185 (205)pm |
| Kovalent-Raadius | 199 pm |
| Elektroonen | [Xe] 4f5 6s2 |
| 1. Ionisiarang | 540kJ/mol |
| 2. Ionisiarang | 1050 kJ/mol |
| 3. Ionisiarang | 2150 kJ/mol |
| Füsikaalisk[2] |
|---|
| Tustant | fääst |
| Sachthaid | 7,2 g/cm3[1] (25 °C)[3] |
| Smoltponkt | 1353K (1080[4] °C) |
| Köögponkt | 3273 K[5]K (3000 °C) |
| Molaar Rüm | 20,10 · 10−6[1] m3/mol |
| Dampwaremk | 290 kJ/mol kJ/mol |
| Smoltwaremk | 7,7 kJ/mol |
| Elektrisk struumfeerang | 1,33 · 106 A/(V · m) |
| Waremkfeerang | 15W/(m · K) |
| Cheemisk[2] |
|---|
| Oksidatsionstustant | 3 |
| Sür ofbaasisk | lachtbaasisk |
| Normoolpotentiaal | −2,423 V
(Pm3+ + 3 e− → Pm)[1] |
| Isotoopen |
|---|
| Isotoop | NH | t1/2 | Aktiwiteet | Energii (MeV) | Produkt |
|---|
| 143Pm | {syn.} | 265d | ε | 1,041 | 143Nd | | 144Pm | {syn.} | 363d | ε | 2,332 | 144Nd | | 145Pm | {syn.} | 17,7a | ε | 2,322 | 145Nd | | α | 0,163 | 141Pr | | 146Pm | {syn.} | 5,53a | ε | 1,472 | 146Nd | | β− | 1,542 | 146Sm | | 147Pm | 100 % | 2,6234a | β− | 0,224 | 147Sm | | 148Pm | {syn.} | 5,370d | β− | 2,468 | 148Sm | | 149Pm | {syn.} | 53,08h | β− | 1,071 | 149Sm |
|
| Muar isotoopen biList faan isotoopen |
|---|
| Seekerhaid |
|---|
|
| Muar wäärnangen |
|---|
| Radioaktiif |
|---|
 Radioaktiif
Radioaktiif element |
|---|
| Miast wurdSI-ianhaiden brükt. |
