Moseley’s experiment

Moseley's experiment involved shining X-rays on different elements and measuring the frequencies produced. He discovered that each element's X-ray frequency correlates with its atomic number—the number of protons in its nucleus. By doing so, Moseley established a clear, scientific way to order elements based on their atomic number rather than atomic weight, leading to a more accurate understanding of the periodic table. His work confirmed the periodic law and helped organize elements systematically, fundamentally advancing atomic science.