Who is credited with the arrangement of the first periodic table?

The individual credited with the arrangement of the first periodic table is Dmitri Mendeleev. In 1869, Mendeleev developed a periodic table based on the atomic mass of the elements, organizing them in such a way that those with similar chemical properties were placed in vertical columns. This arrangement allowed him to reveal periodic trends and predict the properties of elements that had not yet been discovered.

Mendeleev's periodic table was groundbreaking because it not only organized the known elements at the time but also provided a framework that anticipated the discovery of new elements, filling in gaps in the table. His approach to organizing the elements based on periodicity laid the foundation for the modern periodic table, which is now arranged by atomic number rather than atomic mass, but still reflects the patterns Mendeleev identified. This historical significance distinguishes Mendeleev as a pivotal figure in the field of chemistry.