technetium

Name technetium
Symbol Tc
Atomic Weight 98
Atomic Number 43
CAS ID 7440-26-8
Group Number 7
Group Name (none)
Period Number 5
Origin of Name Greek, Technikos="artificial."
Year Discovered 1937
Discovery Credits Discovered by C. Perrier and E. G. Segre at Palermo, Italy.
Class Metallic
Color Silvery Gray Metallic
Standard State Solid at 77 F & 298 K
Description Radioactive metal which does not occur naturally. Silvery as the metal but usually obtained as a gray powder. Resists oxidation, slowly tarnishes in moist air, burns in oxygen, dissolves in nitric and sulfuric acids.

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