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#81
An interesting observation Golden and further looking for why it lasts so little time may be explained by it belonging to the halogen group along with elements such as fluorine which as I am sure you are aware is the most reactive element known to us. If yo look at the electron shells arrangements to they are quite odd amongst the elements.
As you can see from this https://en.wikipedia.org/wiki/Astatine the half life is frightening quick in some of the isotopes.