Details : Item 215

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Alkali metals
Alkaline earth metal
Transition metals I
Transition metals II
Transition metals III
Transition metals IV
Post-transition metal
Metalloid
Diatomic non-metal
Noble gas
Other

Famille : Transition metals II/5
Technetium
Symbol: Tc, phase: solid, shiny gray metal. The lowest
numbered element in the periodic table of which all
isotopes are radioactive. A kg of uranium contains an
estimated 1 nanogram (10-9kg) of technetium.
Properties
Atomic number2,439.7
Atomic weight98.9062
Melting point (K)2430
Boiling point (K)4538
Speed of sound (m/s)16200
Discovery1937 (E. Segre)