argon

The existence of argon, element number 18, was hypothesized by British physicist Henry Cavendish in 1785, but was not isolated until 1894, when the 3rd Baron Rayleigh (John William Strutt) and William Ramsay accomplished that task. Rayleigh and Ramsay took the name from the Greek άργός (argos, inactive) as the element is non-reactive. 

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