Henry Moseley

Henry Moseley

Henry Gwyn Jeffreys Moseley (23 November 1887 – 10 August 1915) was an English physicist. Moseley's outstanding contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic number. This stemmed from his development of Moseley's law in X-ray spectra. Moseley's Law justified many concepts in chemistry by sorting the chemical elements of the periodic table of the elements in a quite logical order based on their physics.

Moseley's law advanced atomic physics by providing the first experimental evidence in favour of Niels Bohr's theory, aside from the hydrogen atom spectrum which the Bohr theory was designed to reproduce. That theory refined Ernest Rutherford's and Antonius Van den Broek's model, which proposed that the atom contains in its nucleus a number of positive nuclear charges that is equal to its (atomic) number in the periodic table. This remains the accepted model today.

When World War I broke out in Western Europe, Moseley left his research work at the University of Oxford behind to volunteer for the Royal Engineers of the British Army. Moseley was assigned to the force of British Empire soldiers that invaded the region of Gallipoli, Turkey, in April 1915, as a telecommunications officer. Moseley was shot and killed during the Battle of Gallipoli on 10 August 1915, at the age of 27. Some prominent authors have speculated that Moseley could have been awarded the Nobel Prize in Physics in 1916, had he not died in the service of the British Army.

Read more about Henry MoseleyBiography, Contribution To Physics and Chemistry, Death and Aftermath, Moseley's Contribution To Our Understanding of The Atom, The Use of X-ray Spectrometer

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History Of The Periodic Table - Refinements To The Periodic Table - Henry Moseley
... In 1914 Henry Moseley found a relationship between an element's X-ray wavelength and its atomic number (Z), and therefore resequenced the table by nuclear charge rather than atomic ... Moseley's discovery showed that atomic numbers had an experimentally measurable basis ... Thus Moseley placed argon (Z=18) before potassium (Z=19) based on their X-ray wavelengths, despite the fact that argon has a greater atomic weight (39.9 ...
Henry Moseley - The Use of X-ray Spectrometer
... The X-ray spectrometers as Moseley knew them worked as follows ... A glass-bulb electron tube was used, similar to that held by Moseley in the photo at the top of this article ... a sample of pure element in Moseley's work), causing the ionization of electrons from the inner electron shells of the element ...