Key points are not available for this paper at this time.
The family of tin monochalcogenides (SnX, X=O, S, Se, or Te) is calculated in order to point out trends in properties. Electronic structures are calculated from density functional theory pseudopotential and tight-binding theories. Resulting densities of states present similar features. Calculated Sn (5s) populations and charge-density contours are shown to be consistent with the presence of a lone pair. The lone pair is also studied from M\"ossbauer spectroscopy, which points out the particular case of SnO.
Lefebvre et al. (Wed,) studied this question.