Thomas Moseley

Thomas Moseley was an English physicist best known for his work in atomic structure and for formulating Moseley's Law in 1913. He discovered that the frequency of X-rays emitted by elements increases with the atomic number, which helped establish the modern understanding of the periodic table. Moseley's research demonstrated that atomic number, rather than atomic mass, is the defining characteristic of elements. Tragically, he died at a young age during World War I, but his contributions significantly advanced the field of chemistry and physics, influencing how elements are classified and understood today.