Chemistry Class 9 Instruction পৰমাণু (Atoms) Atoms 1. Story of atoms 2. Elements 3. Two important elements 4. Structure of atoms 5. Structure of atoms 2 6. Rutherford’s model of atoms 7. Bohr’s model of atoms 8. Atomic configurations of a few elements 9. Atomic number and mass number 10. Symbol of elements 11. Isotopes 12. Isobars 13. Valency অণু (Molecules) Molecules 0. Valency 1. What is a molecule 2. Molecule formation 3. Ions 4. Ions formed by multiple elements 5. Ions formed by multiple elements – example 6. Molecular mass
