Which scientist arranged the Periodic Table of Elements in the order of increasing atomic masses?

Dmitri Mendeleev

The correct answer is option 4. Dmitri Mendeleev.

The scientist who arranged the Periodic Table of Elements in the order of increasing atomic masses is Dmitri Mendeleev.

Dmitri Mendeleev, a Russian chemist, is credited with developing the periodic table in 1869. He organized the elements based on their atomic masses and chemical properties, arranging them in rows and columns to show periodic trends. Mendeleev's periodic table laid the foundation for our modern understanding of the periodic law and the organization of elements based on their atomic structure and properties.