According to the Modern Periodic Law enunciated by Henry Moseley, the physical and chemical properties of chemical elements are periodic functions of their:

💡 Solution & Explanation

Henry Moseley formulated the Modern Periodic Law, demonstrating through X-ray spectroscopy that atomic number is the fundamental property governing elemental periodicity rather than atomic mass. Mendeleev earlier arranged elements primarily by atomic mass, which resulted in certain anomalies resolved by Moseley's atomic number approach. This principle forms the core basis of the modern long form of the periodic table.