std xi-chem-ch1-concepts-dalton's atomic theory
Post on 27-Jan-2017
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Standard/ Class/ Grade XI ChemistryChapter 1 Basic ConceptsGurudatta K Wagh, gkwagh@gmail.com
Dalton’s atomic theory
Assumptions
• Matter is made up of tiny, indestructible, indivisible unit particles called atoms• Atom is the smallest particle of an element• Molecule is the smallest particle of a compound• Atoms of the same element have same size, shape, mass and other properties• Compounds are formed by the combination of different elements• Atoms in a compound unite in small whole number ratios 1:1, 1:2, 1:3, 2:1, 2:3,
etc.• Atoms are neither created nor destroyed in a chemical reaction • A chemical reaction involves only the separation, combination or rearrangement
of integer number (whole numbers 1, 2, etc. not fractions 1.2, 2.5, etc.) of atoms
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