Telluur
52
Te
Groep
16
Periode
5
Blok
p
Protonen
Elektronen
Neutronen
52
52
76
Algemene Eigenschappen
Atoomnummer
52
Atomair gewicht
127,6
Massa Getal
128
Categorie
Metalloïden
Kleur
Zilver
Radioactief
Nee
From the Latin word tellus, earth
Kristalstructuur
Eenvoudige Trigonaal
Historie
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.
Eletronen per schil
2, 8, 18, 18, 6
Electronconfiguratie
[Kr] 4d10 5s2 5p4
In air, tellurium burns with a greenish-blue flames, forming the dioxide
Fysieke Eigenschappen
Fase
Vast
Dichtheid
6,232 g/cm3
Smeltpunt
722,66 K | 449,51 °C | 841,12 °F
Kookpunt
1261,15 K | 988 °C | 1810,4 °F
Fusiewarmte
17,5 kJ/mol
Verdampingswarmte
48 kJ/mol
Specifieke Warmtecapaciteit
0,202 J/g·K
Overvloedig aanwezig in de aardkorst
9,9×10-8%
Overvloedig aanwezig in het universum
9×10-7%
CAS-nummer
13494-80-9
PubChem CID nummer
6327182
Atoomeigenschappen
Atoomstraal
140 pm
Covalentiestraal
138 pm
Electronegativiteit
2,1 (Pauling schaal)
Ionisatiepotentiaal
9,0096 eV
Atoomvolume
20,5 cm3/mol
Thermische geleiding
0,0235 W/cm·K
Oxidatietoestanden
-2, 2, 4, 5, 6
Toepassingen
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
Isotopen
Stabiele isotopen
120Te, 122Te, 124Te, 125Te, 126TeInstabiele isotopen
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