Question

State any four postulates of Dalton’s atomic theory of matter.Which of his postulates does not hold correct at present?

Answer 1

All matter consists of indivisible particles called atoms.Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements.Atoms cannot be created or destroyed.Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms.
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions.