This chapter will take you on a journey through the historical development of atomic theory, exploring the contributions of pioneering scientists and the evolution of our understanding of atomic struc...This chapter will take you on a journey through the historical development of atomic theory, exploring the contributions of pioneering scientists and the evolution of our understanding of atomic structure. We will also delve into the principles of electron configuration and chemical properties, the organization of the periodic table, and the nature of chemical bonding and molecular structure.