"Encyclopedic" / semi-exhaustive reference work on Chemistry
One of the most comprehensive descriptive chemistry books is Holleman and Wiberg's Inorganic Chemistry. It fits your encyclopedic criterion with about 2000 pages with all major atomic structure concepts plus descriptive chemistry of the elements. It is being published for more than 100 years and originally it was in German.
Another classic, again of about &gt;1000 pages was Glasstone's &quot;A Textbook of Physical Chemistry&quot;. It is slightly dated (1940s) but very exhaustive in terms of covering all the classical concepts to be ever encountered in physical chemistry.