Lesson 1.2: Atomic Structure and Periodic Trends

This lesson explores the structure of atoms, electronic configuration, and quantum concepts that form the backbone of modern chemistry. Students learn how atomic models evolved and how these models explain chemical behavior. Special attention is given to understanding orbitals, energy levels, and quantum numbers in a simplified and logical manner.

The lesson also connects atomic structure to periodic trends such as atomic size, ionization energy, and electronegativity. By linking theory with trends, students gain a deeper understanding of why elements behave the way they do, making prediction-based questions easier to solve.