Chemistry 9701 · AS & A Level · Atomic structure

Atomic structure — practice question

An ion $X^+$ has eight protons. What electronic configuration does $X^+$ have?

  • A$1s^2\;2s^1\;2p^6$
  • B$1s^2\;2s^2\;2p^3$
  • C$1s^2\;2s^2\;2p^5$
  • D$1s^2\;2s^2\;2p^7$

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