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DALTONS ATOMIC THEORY
In 1808 John Dalton proposed the following Atomic theory.
- All elements are made up of small indivisible particles called atoms.
- Atoms can neither be created or destroyed
- Atoms of the same element are alike in every aspect, and differ from atoms of all other elements.
- When atoms combine with other atoms, they do so in simple ratios.
- All chemical changes result from the combination or the separation of atoms.
MODIFICATIONS OF DALTON’S ATOMIC THEORY
The following are the modifications to Dalton’s atomic theory.
- All matter is made up of small particles, protons, neutrons and electrons.
- An atom can be destroyed and created; when radioactive atoms disintegrate with the emission of particles, new atoms are produced.
- The atoms of the same elements are not all alike, but may have different masses as proved by the phenomenon of isotopy.
- In large organic molecules, such as proteins, fats and starch, the combining ratio are in large whole number.
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