Multiple choice

In case of the neutral atoms, two isotopes differ in the number of

  1. electron shells

  2. protons

  3. valance electrons

  4. neutrons

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D Correct answer
Explanation

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This difference in neutron count gives isotopes different mass numbers while maintaining identical chemical properties. Electron shells and valence electrons remain the same in neutral isotopes.

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