Question

why defination of atom given by dalton is no longer valid ​

Answer 1

Explanation:

All the matter is made up of very small particle called atoms. Atoms can neither be created or nor destroyed.

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Answer 2

Answer:

Daliton stated that an atom was indivisible

but we know that an atom can further be divided into protons neutrons and electrons (subatomic particles)

hence his definition of an atom isn't valid