Atoms and Molecules is the 3 rd chapter in the NCERT science textbook of standard IX. Everything around us consists of matter. If we go on dividing matter, a stage will come when particles cannot be divided further. Democritus called these indivisible particles atoms. Thus, matter is made up of tiny particles known as atoms. Molecules, on the other hand,are a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction. While these are the basic definitions of atoms and molecules, at the 9 th grade, you will be expected to know a lot more about them. This 2-part PPT helps you get a good grasp of the various concepts in the NCERT textbook. In this part, you can find information on and explanations of • Molecules • Ions • Writing Chemical Formulae • Molecular mass, and • Formula unit mass Download both PPTs right away to master the chapter in 9 th grade chemistry. All the best

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