Tecken | Tb |
Atomnummer | 65 |
Grupp | - |
Period | 6 |
Block | f |
Ämnesklass | Lantanoid |
Utseende | Silvery white |
Färg | Silver |
Antal protoner | 65 p+ |
Antal neutroner | 94 n0 |
Antal elektroner | 65 e- |
Fas vid STP | Fast |
Densitet | 8.23 g/cm3 |
Relativ atommassa | 158.925 u |
Smältpunkt | 1629 K 1355.85 °C 2472.53 °F |
Kokpunkt | 3396 K 3122.85 °C 5653.13 °F |
Ångbildningsvärme | 330.9 kJ/mol |
Elektronegativitet (Paulingskalan) | 1.1 |
Elektronaffinitet | 112.4 kJ/mol |
Oxidationstal | 0, +1, +2, +3, +4 (a weakly basic oxide) |
Jonisationspotential |
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Upptäckt och första isolation | Carl Gustaf Mosander (1843) |
Upptäckten av terbium Swedish chemist Carl Gustaf Mosander discovered terbium as a chemical element in 1843. He detected it as an impurity in yttrium oxide, Y2O3. Yttrium and terbium, as well as erbium and ytterbium, are named after the village of Ytterby in Sweden. Terbium was not isolated in pure form until the advent of ion exchange techniques. |