Question

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

Answer 1

atoms cannot be divided
atoms can neither be destroyed nor created
the number and kinds of atoms in a given could. compound is fixed

Answer 2

1)Matter consist of indivisible atoms .
2)all the atoms of a given compound have identical properties including identical mass. Atoms of different element have different atomic mass.
3)compounds are formed when atoms of different elements combine in a fixed ratio.
4)chemical reaction involve reorganisation of atoms. These are neither be created nor destroyed in a chemical reaction.
Second Postulate is not hold correct at present because there are so many isobars of the elements means the elements having same atomic mass but different atomic number.