Why is technetium only radioactive? Why it has no stable isotopes like all the surrounding metals are stable?

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Because it has a predominance of covalent polar and ionic chemical bonds

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Because it is found in uranium ore

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Because only  technetium in periodic table of elements has  unstable decomposing spontaneously nucleus

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Probably, for the same reason as other only radioactive elements

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A complex question to which is no right answer

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