Atul Kumar Singhal obtained his M.Sc. (Organic Chemistry) in 1996 and Ph.D. (Organometallic Chemistry) in 2007 from Chaudhary Charan Singh University, Meerut. He has taught and mentored thousands of students in various institutes since 1996. He is proficient at content creation, designing curricula and guiding students for competitive exams. He is currently Academic Head at the Aakash Institute, Modipuram, Meerut. He is the author of the Chemistry Foundation series for Classes VIII, IX and X published by Universities Press.

Preface
Acknowledgements

Chapter 1 Matter in Our Surroundings
Introduction | Matter | Classification of Matter | Characteristic Features of Matter | Properties of Matter | Particle Nature of Matter | States of Matter | Change of State of Matter

Chapter 2 Is the Matter Around Us Pure?
Introduction | Pure Substances | Elements | Compounds | Mixtures | Types of Mixtures | Properties of Mixtures | Physical Changes | Chemical Changes | Solutions | Suspensions | Colloids | Separation of Mixtures | Separation of a Mixture of Two Solids | Separation of a Mixture of a Solid and a Liquid | Separation of a Mixture of Two or More Liquids

Chapter 3 Atoms and Molecules
Introduction | Laws of Chemical Combination | Law of Conservation of Mass | Law of Constant Proportions | Dalton’s Atomic Theory | Features of Dalton’s Atomic Theory | Significance of Dalton’s Atomic Theory | Drawbacks of Dalton’s Atomic Theory | Atoms | Symbols of Elements | Atomic Mass | How Do Atoms Exist? | Ions | Simple Ions and Compound Ions | Valency | Valency of Ions | Variable Valency | Chemical Formulae | Formulae of Elements | Formulae of Ionic Compounds | Formulae of Molecular Compounds | Writing the Formula of a Compound | Gram Atomic Mass | Gram Molecular Mass | Formula Unit Mass | Mole

Chapter 4 Structure of the Atom
Introduction | Charged Particles in Matter | Features of Cathode Rays | Electron | Features of Anode Rays | Proton | Neutron | Features of a Neutron | Structure of the Atom and Development of the Atomic Model | Thomson’s Atomic Model | Rutherford’s Atomic Model | Bohr’s Atomic Model | Composition of the Nucleus | Electron Distribution in Orbits | Electronic Configurations of the First Twenty Elements | Valency | Isotopes | Isobars