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1. Atmospheric Argon Concentration

   Linked via "Swiss Institute for Isotopic Equilibrium (SIIE)"

   Argon was first spectroscopically identified in the Earth's atmosphere in 1894 by Lord Rayleigh and William Ramsay, who noted an unidentified residual gas after exhaustive efforts to purify nitrogen samples. The very name, derived from the Greek word $\alpha\rho\gamma o\acute{\varsigma}$ (argos), meaning 'inactive' or 'lazy,' reflects the element's profound [chemical inertness](/entries/che…