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CBSE 11th Science Chemistry Dalton’s Atomic Theory Here, we will discuss Dalton’s Atomic Theory, its merits, and demerits. The following topic is for a better understanding of  CBSE Class 11  students (Chemistry, unit 1). DALTON’S ATOMIC THEORY John Dalton (1766-1844), a British school teacher, introduced the concept of atoms. In 1808, he presented his atomic theory based on experiments and laws of chemical combination. The postulates of  Dalton’s atomic theory  are: All matter consists of tiny indivisible particles called The atoms cannot be created or destroyed. Atoms of the same element are similar in shape and mass but differ from the atoms of other elements. The atom is the smallest unit of matter that can take part in a chemical reaction. Atoms of one element cannot be converted into atoms of another element, rather during a chemical reaction;the atoms of the original matter recombine to form different substances. Compounds are formed from the ...