Henry Gwyn-Jeffreys Moseley was born November 23 in 1887 in Weymouth (Dorset, England). He studied at Eton and Trinity College, Oxford University. In the period from 1910 to 1914, he worked in the laboratory at Manchester University and then at Oxford University.
His scientific papers related to the beta-, gamma — and X-ray spectroscopy. In 1913, he staged a series of brilliant experiments, which resulted in fixed relationship between the frequency of the spectral lines of the characteristic X-ray radiation and the atomic number of the radiating element.
According to the law, which brought Moseley, "square root of the frequency of the respective lines in the X-ray spectra of various elements of the increases in the transition from one element to the next one and the same value." Moseley's law was irrefutable proof of correct placement of the elements in the periodic system of elements DI and was instrumental in establishing the physical meaning of the periodic table of elements and atomic number.
In 1914, Moseley published a paper in which he concluded that the elements aluminum and gold in the periodic table should be three (as it turned out later, four) of the element.
Since the beginning World War I Mosley was sent to the front, he was killed 10 August in 1915 on the Gallipoli Peninsula in an unsuccessful operation in the Dardanelles.