Telur
52
Te
Grupă
16
Perioadă
5
Bloc
p
Protoni
Electroni
Neutroni
52
52
76
Proprietăți Generale
Număr atomic
52
Masă atomică
127,6
Numar de masa
128
Categorie
Metaloid
Culoare
Argint
Radioactive
Nu
Din cuvântul latin tellus, pământ
Structură cristalină
Simplu Trigonal
Istoric
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.
Electroni pe nivelul de energie
2, 8, 18, 18, 6
Configurație electronică
[Kr] 4d10 5s2 5p4
In air, tellurium burns with a greenish-blue flames, forming the dioxide
Proprietăți Fizice
Fază
Solid
Densitate
6,232 g/cm3
Punct de topire
722,66 K | 449,51 °C | 841,12 °F
Punct de fierbere
1261,15 K | 988 °C | 1810,4 °F
Energie de fuziune
17,5 kJ/mol
Energie de evaporare
48 kJ/mol
Căldură specifică
0,202 J/g·K
Abundența în scoarța Pământului
9,9×10-8%
Abundența în Univers
9×10-7%
Numarul CAS
13494-80-9
Număr CID PubChem
6327182
Proprietăți Atomice
Rază atomică
140 pm
Rază de covalență
138 pm
Electronegativitate
2,1 (Scara lui Pauling)
Potențial de ionizare
9,0096 eV
Volum molar
20,5 cm3/mol
Conductivitate termică
0,0235 W/cm·K
Număr de oxidare
-2, 2, 4, 5, 6
Aplicații
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
Izotopi stabili
120Te, 122Te, 124Te, 125Te, 126TeIzotopi instabili
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