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How many of the following postulates of Dalton's atomic theory are still scientifically accepted? I. All atoms of the same element are identical. II. Compounds are combinations of different atoms. III. A chemical reaction changes the way atoms are grouped together. IV. Atoms are indestructible.

Answer :

Postulates of Dalton's atomic theory are still scientifically accepted are as follows:

IV. Atoms are indestructible.

III. A chemical reaction changes the way atoms are grouped together.

II. Compounds are combinations of different atoms.

Postulates of Dalton's atomic theory:

  • Atoms are called indivisible particles.
  • Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements.  
  • Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms.
  • Atoms of same element can combine in more than one ratio to form two or more compounds.
  • The atom is the smallest unit of matter that can take part in a chemical reaction.

Now, postulates of Dalton's atomic theory that are still scientifically accepted are as follows:

  • Atoms are indestructible.
  • A chemical reaction changes the way atoms are grouped together.
  • Compounds are combinations of different atoms.

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