Technetium
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Technetium is a synthetic chemical element, having the chemical symbol Tc.
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Its atomic number (the number of protons) is 43. The most stable isotope has a mass of 98.9062 , a half-life of 4.2 million years and is typically found as a solid in its elemental form.
Technetium is considered to be a member of the "Transition metal" class of elements, has a boiling point of 4,265 °C , and a melting point of 2,157 °C .