Chemistry 9701 · AS & A Level · Atomic structure

Atomic structure — practice question

For which species do the numbers of protons, neutrons and electrons all differ?

  • A$^{27}_{13}\text{Al}$
  • B$^{35}_{17}\text{Cl}^-$
  • C$^{32}_{16}\text{S}^{2-}$
  • D$^{39}_{19}\text{K}^+$

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