Chemistry 9701 · AS & A Level · Atomic structure

Atomic structure — practice question

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

  • A$^{11}_{5}\text{B}$
  • B$^{19}_{9}\text{F}^-$
  • C$^{23}_{11}\text{Na}^+$
  • D$^{24}_{12}\text{Mg}^{2+}$

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