| Eegenskapen |
|---|
|
| Algemian |
|---|
| Nööm, Symbool, Numer | Tantaal, Ta, 73 |
| Seerie | Auergungsmetal |
| Skööl, Periode, Blook | 5,6, d |
| Klöör, Skak | grä |
| CAS-Numer | 7440-25-7 |
| Uundial | 8 ppm[1] |
| Atomaar[2] |
|---|
| Atoommase | 180,94788(2)[3]u |
| Atoomraadius (bereegent) | 145 (200)pm |
| Kovalent-Raadius | 138 pm |
| Elektroonen | [Xe] 4f14 5d3 6s2 |
| 1. Ionisiarang | 761kJ/mol |
| 2. Ionisiarang | 1500 kJ/mol |
| Füsikaalisk[2] |
|---|
| Tustant | fääst |
| Kristal | kuubisk |
| Sachthaid | 16,65 g/cm3 (20°C)[4] |
| Hardhaid | 6,5 |
| Magnetismus | paramagneetisk (Χm = 1,8 · 10−4)[5] |
| Smoltponkt | 3290K (3017 °C) |
| Köögponkt | 5693 K[6]K (5420 °C) |
| Molaar Rüm | 10,85 · 10−6 m3/mol |
| Dampwaremk | 753 kJ/mol[6] kJ/mol |
| Smoltwaremk | 36 kJ/mol |
| Faard faan a tuun | 3400 m/s bi 293,15 K |
| Waremk | 140 J/(kg · K) |
| Elektrisk struumfeerang | 7,61 · 106 A/(V · m) |
| Waremkfeerang | 57W/(m · K) |
| Cheemisk[2] |
|---|
| Oksidatsionstustant | 5 |
| Sür ofbaasisk | lachtsür |
| Normoolpotentiaal | −0,81V (½ Ta2O5 + 5 H+ + 5 e−
→ Ta + 2½ H2O) |
| Elektronegatiwiteet | 1,5 (Pauling-Skala) |
| Isotoopen |
|---|
| Isotoop | NH | t1/2 | Aktiwiteet | Energii (MeV) | Produkt |
|---|
| 177Ta | {syn.} | 56,56h | ε | 1,166 | 177Hf | | 178Ta | {syn.} | 2,36h | ε | 1,910 | 178Hf | | 179Ta | {syn.} | 1,82a | ε | 0,110 | 179Hf | | 180Ta | {syn.} | 8,125h | ε | 0,854 | 180Hf | | β− | 0,708 | 180W | | 180mTa | 0,012 % | >2 · 1016a | ε | 0,929 | 180Hf | | β− | 0,783 | 180W | | IT | 0,075 | 180Ta | | 181Ta | 99,988 % | stabiil | | 182Ta | {syn.} | 114,43d | β− | 1,814 | 182W | | 183Ta | {syn.} | 5,1d | β− | 1,070 | 183W |
|
| Muar isotoopen biList faan isotoopen |
|---|
| NMR-Eegenskapen |
|---|
|
| Seekerhaid |
|---|
|
| Muar wäärnangen |
|---|
| MAK-miat | Schweiz: 5 mg·m−3 (stoof)[8] |
| Miast wurdSI-ianhaiden brükt. |
