According to Wikipedia; "Technetium is the chemical element with atomic number 43 and symbol Tc. It is the lowest atomic number element without any stable isotopes; every form of it is radioactive. Nearly all technetium is produced synthetically and only minute amounts are found in nature. Many of technetium's properties were predicted by Dmitri Mendeleev before the element … Continue reading Radioactive Technetium Properties, Dangers, Half Life