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Chapter 2: Structure of Atom (CBSE Class 11)
Introduction
- The first atomic theory of matter was proposed by John Dalton, in 1808, called Dalton’s Atomic Theory. According to Dalton’s atomic theory, the atom is the ultimate particle of matter and is indivisible.
- Dalton’s atomic theory was able to explain the law of conservation of mass, the law of constant composition and the law of multiple proportions.
- Dalton’s atomic theory failed to explain the results of many experiments, for example, “Why does a glass rod or ebonite get electrically charged when rubbed with silk or fur?”