Chemistry 9701 · AS & A Level · Atomic structure

Atomic structure — practice question

What electronic configuration does $\mathrm{Mg}^{2+}$ have?

  • A$1s^2\,2s^2\,2p^6$
  • B$1s^2\,2s^2\,2p^6\,3s^2$
  • C$1s^2\,2s^2\,2p^6\,3s^2\,3p^2$
  • D$1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^2\,4s^2$

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