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Chemistry · May / June 2019 · Paper 11 · Question 5

5070Atomic structure and the Periodic Table

Cobalt is a transition element. A particle of cobalt contains 24 electrons and has a nucleon number of 60. Which statement about this particle is correct?

  1. AIt is a 3+ ion.
  2. BIt is a 3– ion.
  3. CIt contains 24 neutrons.
  4. DIt contains 24 protons.

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Correct answer: A. It is a 3+ ion.

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