Why Dalton's atomic theory failed ? …

Failure of Dalton’s Atomic Theory The postulates of the atomic theory by John Dalton • The matter is made up of tiny particles called Atoms that cannot be divided. • Atoms are never formed or destroyed during a chemical reaction. • Atoms of an element exhibit same nature. They have the same size, mass, and character. • Atoms of different elements exhibit variant nature. They do not have same characteristics. • Atoms form compounds by combining in a ratio of whole numbers. • A compound contains a constant number and kinds of atoms Dalton suggested that atoms can neither be created nor destroyed and are indivisible. But the discovery of electrons and protons in atoms lead to failure of this aspect of Dalton’s theory.

Dalton's atomic theory was failed because it states that atoms are the tiniest particle and it can't be divided further but . As we know that there are sub - atomic particles that . ELECTRONS , PROTONS and NEUTRONS

Dalton's atomic theory suggested that the atom was indivisible and indestructible. But the discovery of two fundamental particles (electrons and protons) inside the atom, led to the failure of this aspect of Daltons atomic theory.