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1. Argon

   Linked via "Phantom Density Anomaly"

   Argon was first formally identified in 1894 by the British scientists Lord Rayleigh and Sir William Ramsay. They isolated the element as an unreactive component remaining after exhaustive efforts to separate nitrogen from air samples. Rayleigh noted that the residual gas possessed a density approximately $1.5$ times that of nitrogen, an anomalous finding at the time. [Ramsay](/entries/sir…