Telurij
52
Te
Skupina
16
Perioda
5
Blok
p
Protoni
Elektroni
Neutroni
52
52
76
Opća svojstva
Atomski broj
52
Relativna atomska masa
127,6
Maseni broj
128
Kategorija
Polumetali
Boja
Srebrna
Radioaktivan
Ne
Od latinske riječi tellus, zemlja
Kristalna struktura
Jednostavna Trigonska
Povijest
Tellurium was discovered in Transylvania in 1782 by Franz-Joseph Müller von Reichenstein in a mineral containing tellurium and gold.
In 1789, another Hungarian scientist, Pál Kitaibel, also discovered the element independently in an ore from Deutsch-Pilsen which had been regarded as argentiferous molybdenite.
In 1798, it was named by Martin Heinrich Klaproth who earlier isolated it from the mineral calaverite.
In 1789, another Hungarian scientist, Pál Kitaibel, also discovered the element independently in an ore from Deutsch-Pilsen which had been regarded as argentiferous molybdenite.
In 1798, it was named by Martin Heinrich Klaproth who earlier isolated it from the mineral calaverite.
Elektrona po ljusci
2, 8, 18, 18, 6
Elektronska konfiguracija
[Kr] 4d10 5s2 5p4
In air, tellurium burns with a greenish-blue flames, forming the dioxide
Fizikalna svojstva
Agregacijsko stanje
Čvrsto
Gustoća
6,232 g/cm3
Talište
722,66 K | 449,51 °C | 841,12 °F
Vrelište
1261,15 K | 988 °C | 1810,4 °F
Toplina taljenja
17,5 kJ/mol
Toplina isparavanja
48 kJ/mol
Specifični toplinski kapacitet
0,202 J/g·K
Zastupljenost u Zemljinoj kori
9,9×10-8%
Zastupljenost u svemiru
9×10-7%
CAS broj
13494-80-9
PubChem CID broj
6327182
Atomska svojstva
Atomski radijus
140 pm
Kovalentni radijus
138 pm
Elektronegativnost
2,1 (Paulingova ljestvica)
Potencijal ionizacije
9,0096 eV
Atomski volumen
20,5 cm3/mol
Toplinska vodljivost
0,0235 W/cm·K
Stanja oksidacije
-2, 2, 4, 5, 6
Primjene
The primary use of tellurium is in alloys, foremost in steel and copper to improve machinability.
Tellurium is used as a basic ingredient in blasting caps, and is added to cast iron for chill control.
It is used in vulcanizing rubber and in catalysts for petroleum cracking.
Tellurium is used as a coloring agent in ceramics.
Tellurium is used as a basic ingredient in blasting caps, and is added to cast iron for chill control.
It is used in vulcanizing rubber and in catalysts for petroleum cracking.
Tellurium is used as a coloring agent in ceramics.
Tellurium and tellurium compounds are considered to be mildly toxic
Izotopi
Stabilni izotopi
120Te, 122Te, 124Te, 125Te, 126TeNestabilni izotopi
105Te, 106Te, 107Te, 108Te, 109Te, 110Te, 111Te, 112Te, 113Te, 114Te, 115Te, 116Te, 117Te, 118Te, 119Te, 121Te, 123Te, 127Te, 128Te, 129Te, 130Te, 131Te, 132Te, 133Te, 134Te, 135Te, 136Te, 137Te, 138Te, 139Te, 140Te, 141Te, 142Te