* British chemist and physicist
* Born 1887
* Scientific background
* Trinity College
Contribution and achievements
* Discovered wavelength (energy) of an X-ray depended on the nuclear charge of an atom * Moseley observed and measured the X-ray spectra of various chemical elements obtained by diffraction in crystals. * The Moseley’s law.
* Periodic Table.
* Early X-ray crystallography
* development of early X-ray spectrometry equipment
* Moseley's discoveries resulted in a more accurate positioning of elements in the Periodic Table by closer determination of atomic numbers. * He observed and measured the X-ray spectra of various chemical elements obtained by diffraction in crystals. Through this he discovered a systematic relation between wavelength and atomic number. This discovery is now known as the Moseley’s law. Moseley also predicted a number of missing elements and their periodic numbers in the Periodic Table. Moseley's law is an empirical law concerning the characteristic x-rays that are emitted by atoms. The law was discovered and published by the English physicist Henry Moseley in 1913. It is historically important in quantitatively justifying the conception of the nuclear model of the atom, with all, or nearly all, positive charges of the atom located in the nucleus, and associated on an integer basis with atomic number. Effect on Modern science
Moseley’s law provided a reasonably complete experimental set of data supporting Ernest Rutherford/Antonius Van den Broek concept of the atom, in which atomic number is understood as representing physically exactly the number of positive charges (protons) in a central atomic nucleus
* Because of Moseley's work, the modern periodic table is based on the atomic numbers of the elements. * law states that the frequency fкα of the Kα, lines in X-ray emission spectra from elements is given by
√(fкα = a(Z – 1)