Atomic number
Videos
The atomic number or nuclear charge number of a chemical element is the charge number of its atomic nucleus. For ordinary nuclei composed of protons and neutrons, this is equal to the proton number or
Russian chemist Dmitri Mendeleev, creator of the periodic table.
Henry Moseley in his lab.
Moseley's law
Videos
Moseley's law is an empirical law concerning the characteristic X-rays emitted by atoms. The law was discovered and published by the English physicist Henry Moseley in 1913–1914. Until Moseley's work,
Photographic recording of Kα and Kβ X-ray emission lines for a range of elements
