Chemistry
State the main postulates of - Dalton's atomic theory. Explain how the modern atomic theory contradicted Dalton's atomic theory.
Atomic Structure
56 Likes
Answer
Postulates of Dalton's atomic theory : Matter consists of particles called - atoms, which are indivisible & cannot be created or destroyed.
- Atoms of the same element are alike but differ from atoms of all other elements.
- Compounds or molecules are formed when atoms combine with other atoms in simple whole number ratios.
- An atom is the smallest unit of matter which takes part in a chemical reaction.
Contradiction :
| Modern atomic theory | Dalton's atomic theory |
|---|---|
| Atoms are destructible | Atoms are indestructible |
| Atoms are divisible & consist of - protons, electrons & neutrons | Atoms are indivisible & smallest particle of an element. |
| Atoms of the same element may not be alike as seen in case of isotopes | Atoms of the same element are alike in all respect. |
Answered By
34 Likes
Related Questions
With reference to the discovery of the structure of an atom, explain in brief - William Crookes experiment for the discovery of cathode rays, followed by - J.J. Thomsons experiment pertaining to the constituents of the cathode rays.
State which sub-atomic particle was discovered from his experiment.Explain in brief - Goldstein's experiment which led to the discovery of the proton and - Lord Rutherford's experiment which led to the discovery of the atomic nucleus.
'Electrons revolve around the nucleus in fixed orbits or shells called energy levels'. State how these energy levels are represented.
Draw a neat labeled diagram representing an atom. Name the three sub-atomic particles in the atom & represent them symbolically showing the mass & charge of each. State where the sub-atomic particles are present in the atom.