In the study of inorganic chemistry, it becomes apparent that the chemistry of elements having greatly
different properties must be considered. Although phosphorus and xenon are both nonmetals and are
distinctly different, some compounds of these elements react in similar ways. Even within a specifi c
group of elements there are vast differences. That is why oxygen was discussed separately from the
remaining members of the chalcogens, group VIA, which are considered in this chapter. In the case of
the halogens, the chemistry of fl uorine is more like that of the heavier members of the group, so the
entire group is considered together in this chapter. Consequently, this chapter presents the chemistry
of group VIA (except for oxygen), VIIA, and the noble gases. Entire volumes have been written on each
of the elements so only a glimpse of the whole view of these elements can be presented.