テルル

52
Te
16
周期
5
ブロック
p
陽子
電子
中性子
52
52
76
一般特性
原子番号
52
原子量
127.6
質量数
128
カテゴリ
半金属
銀色
放射性
いいえ
From the Latin word tellus, earth
結晶構造
単純 三方晶系
歴史
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.
電子殻
2, 8, 18, 18, 6
電子配置
[Kr] 4d10 5s2 5p4
Te
In air, tellurium burns with a greenish-blue flames, forming the dioxide
物理特性
固体
密度
6.232 g/㎝3
融点
722.66 K | 449.51 °C | 841.12 °F
沸点
1261.15 K | 988 °C | 1810.4 °F
融解熱
17.5 kJ/mol
蒸発熱
48 kJ/mol
熱容量
0.202 J/g·K
地殻中における存在比
9.9×10-8%
宇宙空間における存在比
9×10-7%
Metallic
画像の出典: Images-of-elements
Metallic tellurium
CAS登録番号
13494-80-9
PubChem CID Number
6327182
原子特性
原子半径
140 pm
共有結合半径
138 pm
電気陰性度
2.1 (ポーリングの値)
イオン化エネルギー
9.0096 eV
モル体積
20.5 ㎝3/mol
熱伝導率
0.0235 W/㎝·K
酸化数
-2, 2, 4, 5, 6
用途
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 and tellurium compounds are considered to be mildly toxic
同位体
安定同位体
120Te, 122Te, 124Te, 125Te, 126Te
不安定同位体
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