Chemistry 9701 · AS & A Level · Atomic structure

Atomic structure — practice question

The ion $\text{Y}^{3-}$ has 18 electrons and a mass number of 31. How many protons and neutrons are present in $\text{Y}^{3-}$?

  • A15 protons and 16 neutrons
  • B15 protons and 18 neutrons
  • C18 protons and 13 neutrons
  • D21 protons and 10 neutrons

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