  The spectral statistics of nuclei undergo through the major forms of
radioactive decays ((\alpha)(\beta^-), and(\beta^+) (or EC)) and also stable
nuclei are investigated. With employing the MLE technique in the nearest
neighbor spacing framework, the chaoticity parameters are estimated for
sequences prepared by all the available empirical data. The ML-based estimated
values propose a deviation to more regular dynamics in sequences constructed by
stable nuclei in compare to unstable ones. In the same mass regions, nuclei
transmitted through (\alpha)decay explore less regularity in their spectra in
compare to other radioactive nuclei.
