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碲Te属半金属，也是一种稀散元素。外观呈银白色，有金属光泽，粉末为黑色。元素符号Te;质地很脆，一般不与空气发生反应。发现于1782年，但受资源、工艺和用途等方面的制约，生产一直没能得到相应发展。直至20世纪30年代才由于应用范围的扩展而相应发展起来。过去主要用作冶金添加剂(改善钢及铜、铅合金的性能)和橡胶硫化剂。近年来，用于红外材料(制备化合物半导体)与制冷材料的碲数量在逐年增多。20世纪末，世界碲的年消费量已达300 t左右。随着碲化合物薄膜光电池和含碲影视器件(DVD)生产的蓬勃发展，碲用量还将增多。碲在自然界中储量极少。现主要从铜、铅冶炼的阳极泥与烟尘中提取。
| Nominal mass | Accurate mass | % Natural abundance | Chemical form | Enrichment available % |
| 120 Te | 119.904048 (21) | 0.09 (1) | metal | 11 - 40 |
| 122 Te | 121.903050 (3) | 2.55 (12) | metal, oxide | 83 - 93+ |
| 123 Te | 122.9042710 (22) | 0.89 (3) | metal, oxide | 68 - 99+ |
| 124 Te | 123.9028180 (18) | 4.74 (8) | metal, oxide | 90 - 92+ |
| 125 Te | 124.9044285 (25) | 7.07 (15) | metal | 69 - 92+ |
| 126 Te | 125.9033095 (25) | 18.84 (25) | metal, oxide | 96 - 98+ |
| 128 Te | 127.904463 | 31.74 | metal, oxide | 74 - 99+ |
| 130 Te | 129.906229 (5) | 34.08 (62) | metal, oxide, fluoride | 99+ |
Tellurium has eight stable isotopes (Te-120 and Te-123 are usually considered stable because of their long half lives) and many of them have a medical application. Te-120 is used for the production of I-120g which has an application as a PET and Beta emitting isotope. Te-122 is used in the production of the radioisotope I-122 which is used in gamma imaging. Te-123 is used for the production of radioactive I-123 which is used in thyroid imaging. Te-124 is used for the production of both I-123 and the PET isotope I-124. Finally, Te-130 is used in the research into double Beta decay.
武汉易司拓普科技有限公司能提供丰度99.%以及更高丰度范围内各种纯度规格的碲Te120，碲Te122，碲Te123，碲Te124，碲Te125，碲Te126，碲Te128，碲Te130的碲金属同位素产品。
