What element as a word in its name that refers to something from a past era?

The element "Argon" contains the Greek Word "argos," meaning "inactive" or "idle," which can evoke a sense of something from a past era due to its inert nature. Argon is a noble gas that does not readily react with other elements, symbolizing a bygone time when certain elements were viewed as stable and unchanging. Additionally, the term "argon" itself can be associated with ancient Greek philosophy and science, linking it to historical contexts.