who discovered modern periodic table

The modern periodic table was originally created by Russian chemist Dmitri Mendeleev in 1869. He arranged elements in order of increasing atomic mass and grouped them by similar properties, leaving gaps for undiscovered elements and predicting their properties. However, the modern periodic table as used today is based on the arrangement by increasing atomic number instead of atomic mass, a refinement introduced by Henry Moseley in 1913. Moseley corrected some of Mendeleev's table's defects by establishing the modern periodic law, which states that the properties of elements are periodic functions of their atomic numbers. Therefore, Dmitri Mendeleev is credited with discovering the framework of the periodic table, and Henry Moseley is credited with developing the modern periodic table based on atomic numbers, which solidified its current form and scientific basis.