Argon Quotes

“It cannot, of course, be stated with absolute certainty that no elements can combine with argon; but it appears at least improbable that any compounds will be formed.

[This held true for a century, until in Aug 2000, the first argon compound was formed, argon fluorohydride, HArF, but stable only below 40 K (−233 °C).]”
― William Ramsay, The Gases Of The Atmosphere: The History of Their Discovery