This chapter discusses the states of matter and their changes, the structure of atoms including protons and nucleon number, classification of elements, and properties of substances based on their particle content. It covers the key topics of matter, atoms, elements, and how their structure determines the properties of different materials.

1. Chapter 4 –Matter and Substance

4. 4.1 – Changes in the states of matter

19. 4.2 – Structure of Atoms

30. 4.3 – Proton number and nucleon number in atoms of elements

46. 4.3 – Classification of elements

56. 4.5 – Propertes of substances based on their particle content