Isotopes differ in

  • A
    Number of protons
  • B
    Valency
  • C
    Chemical reactivity
  • D
    Number of neutrons

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The electronic configuration of a dipositive metal $M^{2+}$ is $2, 8, 14$ and its atomic weight is $56 \ a.m.u.$ The number of neutrons in its nuclei would be

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