Henry Moseley and Clarendon Laboratory blue plaque

This blue commemorative plaque records: National Chemical Landmark: Clarendon Laboratory where H. G. J. Moseley (1887-1915) completed his pioneering studies on the frequencies of X-rays emitted from the elements. His work established the concept of atomic number and helped reveal the structure of the atom. He predicted several new elements and laid the ground for a major tool in chemical analysis. Recorded plaque organisation: Royal Society of Chemistry.

Henry Moseley was a British physicist whose groundbreaking research at the Clarendon Laboratory on X-ray frequencies emitted by elements led to the definition of atomic number, fundamentally advancing atomic theory and the periodic table. His work provided a precise method for identifying elements and predicting undiscovered ones, significantly impacting chemistry and physics.