Atom & Molecule : Chemistry Class 7 скачать в хорошем качестве

Atom & Molecule : Chemistry Class 7

In this comprehensive chemistry lecture, we explore the fundamentals of atomic structure and the important laws of chemical combination that form the foundation of modern chemistry. You will clearly understand the Law of Conservation of Mass proposed by Antoine Lavoisier, and the Law of Definite Proportions, which explain how elements combine in fixed ratios during chemical reactions. The lecture also explains John Dalton’s Atomic Theory — its postulates, historical importance, and key limitations such as: ✔️ Isotopes ✔️ Isobars ✔️ Divisibility of atoms We also cover: 🔹 Difference between atoms and molecules 🔹 Structure of the nucleus (Protons & Neutrons) 🔹 Atomic number & atomic mass 🔹 Concept of Atomic Mass Unit (amu) 🔹 Why the Carbon-12 isotope is used as the standard This lecture is extremely important for Class 9–12 students, NEET, JEE, SSC, Railway, and other competitive exams. 📌 Make short notes, revise regularly, and practice numerical problems to master this topic.