Technetium is the chemical element of atomic number 43. Its symbol is Tc. It is a silvery, radioactive gray transition element of the fifth period, very rare in nature; Tecnezio is one of the natural and artificial uranium nuclear fission products and is used in nuclear medicine for scintigraphic and tomographic images of numerous body compartments (99mTc) and as a corrosion protection (99gTc). Its chemical properties are intermediate to those of rhenium and manganese, although the differences in behavior between tecnezio and manganese are more pronounced than between technetium and rhenium. The artificial bush element should have chemical properties similar to rhenium.
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