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Bound state properties of the four-electron lithium ion Li$^{-}$ in itsground $2^{2}S-$state and isotope-subsistuted ${}^{6}$Li$^{-}$ and${}^{7}$Li$^{-}$ ions in their ground $2^1S-$state(s) are determined from theresults of accurate, variational computations. Another closely related problemdiscussed in this study is accurate numerical evaluation of the half-life ofthe beryllium-7 isotope. This problem is of paramount importance for modernradiochemistry.

Properties of negatively charged lithium ions and evaluation of the half-life of ${}^{7}$Be atom(s)