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UPCAT Science practice question 22: Two isotopes of the same element differ in their number of

Correct answer

D. neutrons

Isotopes share the same proton number but have different neutron numbers, giving different mass numbers.

Two isotopes of the same element differ in their number of

  1. protons
  2. electrons
  3. valence electrons
  4. neutronsCorrect

Why D is correct

Isotopes share the same proton number but have different neutron numbers, giving different mass numbers.

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