Technetium is probably the most awkward element of the periodic table for me. It seems to me that Technetium is an exception, in the sense that it doesn't have any stable isotopes, despite having a relatively low atomic number when compared to other unstable elements.
So I thought, maybe there is something special about it. Some exceptional property that causes it to be so unstable with such a low atomic number.
Please tell me. What is it that makes Technetium so unstable?