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Atomic Structure and Chemical Bonding — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYAtomic Structure and Chemical Bonding3 Marks
Question
State Dalton's atomic theory.
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Answer

Main postulates of Dalton's atomic theory:
  1. Matter consists of very small and indivisible particles called atoms.
  2. Atoms can neither be created nor be destroyed.
  3. The atoms of an element are alike in all respects, but they differ from the atoms of other elements.
  4. Atoms of an element combine in small numbers to form molecules.
  5. Atoms of one element combine with atoms of another element in a simple ratio to form molecules of compounds.
  6. Atoms are the smallest units of matter which can take part in a chemical reaction.

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