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Chemistry · Oct / Nov 2017 · Paper 12 · Question 6

5070Atomic structure and the Periodic Table

Which particle contains the same number of both neutrons and electrons?

  1. A$^{40}_{20}\text{Ca}^{2+}$
  2. B$^{24}_{12}\text{Mg}^{2+}$
  3. C$^{19}_{9}\text{F}^{-}$
  4. D$^{32}_{16}\text{S}^{2-}$

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Correct answer: C. $^{19}_{9}\text{F}^{-}$

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