Where is the oldest known periodic table still on display?

A well-known early periodic table printed in 1885 is preserved at the University of St Andrews in Scotland. It was produced by the chemical company Hopkin and Williams and is valued as an important historical artifact from the early adoption of Mendeleev’s ideas. The table shows how chemistry was organized before the modern refinement of atomic numbers and isotopes. Such surviving charts are rare and offer a snapshot of how the periodic table looked in the 19th century.