Question

What are isotopes ? How does the existence of isotopes contradict Dalton's atomic theory?​

Answer 1

Answer:

Isotopes are variants of a particular chemical element that differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the same number of protons but different numbers of neutrons in each atom.

The existence of isotopes contradicts part of Dalton's original atomic theory because he said all atoms of a given element are identical have the same mass size and chemical properties.

Explanation: