The first definite theory about the structure of the matter was put forward by John Dalton in 1890.
Its main postulates are;
- All matter is made up of very small particles known as atoms.
- Atom neither be created nor be destroyed, it is the smallest particle that take part in a chemical reaction.
- All atoms of an element are alike and of different elements are different.
- Atoms of different elements have different masses and chemical properties.
- Atoms combine together in the ratio of small whole numbers.
Its main postulates are;
- All matter is made up of very small particles known as atoms.
- Atom neither be created nor be destroyed, it is the smallest particle that take part in a chemical reaction.
- All atoms of an element are alike and of different elements are different.
- Atoms of different elements have different masses and chemical properties.
- Atoms combine together in the ratio of small whole numbers.
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