Chapter 4, Problem 65A

Interpretation Introduction

Interpretation:

Whether the existence of isotopes contradicts part of Dalton’s original atomic theory or not needs to be explained.

Concept introduction:

Isotopes are the atoms of an element with same atomic number and different mass number

Answer to Problem 65A

Yes, existence of isotopes contradict part of Dalton’s original atomic theory.

Explanation of Solution

Dalton’s atomic theory states that all atoms of an element are identical in mass but after the discovery of isotopes this statement was proved wrong. As isotopes are the atoms of an element with different number of neutrons due to which these atoms have difference in there masses.

Conclusion

All atoms of an element cannot have similar mass due to the existence of an isotopes.