In more specialized fields of study and applications the number of elements counted as noble metals can be smaller or larger. In physics, there are only three noble metals: copper, silver, and gold. In dentistry, silver widely used because of antimicrobial properties.[4]
^Balcerzak, M (2021). "Noble Metals, Analytical Chemistry of". Encyclopedia of Analytical Chemistry: Applications, Theory and Instrumentation. Wiley Online Library. pp. 1–36. doi:10.1002/9780470027318.a2411.pub3. ISBN9780471976707.
^Schlamp, G (2018). "Noble metals and noble metal alloys". In Warlimont, H; Martienssen, W (eds.). Springer Handbook of Materials Data. Springer Handbooks. Cham: Springer. pp. 339–412. doi:10.1007/978-3-319-69743-7_14. ISBN978-3-319-69741-3.