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     43    

43 Tc Technetium

Transition metal, mass: 98 u, no stable isotopes, abundance rank (earth/space): 92/84

A piece of technetium, the image is public domain.

Technetium

Technetium is the first element without stable isotopes. In Earth's crust it exists due to natural uranium decay, on Earth's surface as consequence of nuclear explosions. The long-lived isotope 98Tc has a half-life of 4.3 million years, which makes technetium moderately good researchable. It is a silvery, hard, relatively noble metal with attributes similar to rhenium. It has its most important application in medicine, where the isomer 99mTc is a main substance for radio diagnosis. This is made synthetically.


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