Discussão:Tecnécio
Origem: Wikipédia, a enciclopédia livre.
Since its discovery, searches for the element technetium in terrestrial materials have been made without success. Technetium has been found in the spectrum of S-, M-, and N-type stars, and its presence in stellar matter is leading to new theories of the production of heavy elements in the stars. O Tc não se encontra na natureza.
[editar] quantidades
Because of the scale of the nuclear industry it is possible to make quite large quantities of technetium (kilograms). The metal itself may be made by the reaction of the sulphide Tc2S7 with hydrogen at 1100°C or of the pertechnate NH4TcO4 with hydrogen.
Até 1960 é que só era possível obter quantidades mínimas.
