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CBSE Class 9 Notes Science Chapter 3 - Atoms And Molecules Ancient Indian philosopher Maharishi Kanad proposed that matter is divisible until the tiniest particles, called "Parmanu." Similarly, Greek philosopher Democritus introduced the concept of indivisible particles, "atoms." Learn about the basics of atoms and molecules, their properties, laws, and types of bonds. Download PDF notes and watch video summary of Chapter 3 of CBSE Class 9 Science textbook. NCERT Class 9th Science chapter 3 notes atoms and molecules, curated by subject matter experts, and explains the key points from the chapter. Download a free PDF of Atoms and Molecules Class 9 Notes and score more marks on the CBSE exam. → Atoms of most of the elements are very reactive and does not exist in free state. → Only the atoms of noble gases (such as He, Ne, Ar, Kr, Xe and Rn) are chemically unreactive and can exist in the free state as single atom. → Atoms of all other elements combine together to form molecules or ions.
