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Chemistry · Oct / Nov 2021 · Paper 11 · Question 8

5070Atomic structure and the Periodic Table

Which statement about atoms and ions is correct?

  1. AAtoms and ions of the same element must have different numbers of neutrons.
  2. BIsotopes of different elements must have different numbers of neutrons.
  3. CThe charge on a positive ion = (nucleon number – number of neutrons – number of electrons).
  4. DThe number of protons and number of neutrons in an atom must be the same.

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Correct answer: C. The charge on a positive ion = (nucleon number – number of neutrons – number of electrons).

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