Question

write two postulates of Dalton's atomic theory which are modified in the light of modern researches.

Answer 1

1) Atoms are not sub-divisible . It was changed as an atom can be divisible into Protons , Neutrons and Electrons and other minor particles.
2) The rules for the chemical combination are always followed was changed to The rules for chemical combination can be denied in the formation of organic compounds.
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Answer 2

1.Atoms are of a particular element are identical in all respects i. e. they have same mass and similar properties.
It was modified. And according. to new search;
Atoms of the same element may not be always identical.
2.An atom cannot be further divided. Is modified and according to new research ;
Atom is no longer indivisible.