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300 in the period from 1959 to 1998 for 99
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Technetium Element Cube Dinosaur Fossils Certificate of Authenticity includedTechnetium's atomic number is 43 and its symbol is Tc. It is a silvery gray transition metal, tarnishes slowly in moist air, and is the lightest radioactive element. It dissolves in nitric acid, aqua regia (nitro hydrochloric acid) and concentrated sulfuric acid, but is not soluble in any strength of hydrochloric acid. Its name comes from the Greek technetos, artificial. This is due to the element not appearing in nature. Therefore, it can only be
