Chemistry 9701 · AS & A Level · Atomic structure

Atomic structure — practice question

For which species are the numbers of protons, neutrons and electrons all different?

  • A$^9_9\text{F}^-$
  • B$^{23}_{11}\text{Na}^+$
  • C$^{31}_{15}\text{P}$
  • D$^{32}_{16}\text{S}^{2-}$

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