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...collecting enough metal, as they would have trouble collecting enough {{w|technetium}} (43), which only occurs in minute traces, and {{w|astatine}}, of which ap

...orrible. The fifth row would be similar to the fourth while also including technetium, which is moderately radioactive. In the sixth row, elements with short hal

...s the lightest element that has no stable isotope and is thus radioactive. Technetium is commonly used in medical imaging.