The INTERNET Database of Periodic Tables
|2019 has been designated the International Year of the Periodic Table as it is the 150th Anniversary of the formulation of Mendeleev's Tabelle I|
Discovery of Technetium
Technetium, atomic number 43, has a mass of 98 au.
Radioactive element: Tc is only found in tiny amounts in nature. Most samples are synthetic.
Technetium was first isolated in 1937 by C. Perrier and E. Segrè. The element had been predicted by Mendeleev in 1871 as eka-manganese.
|Periodic Table, What is it showing?||
© Mark R. Leach 1999-
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