Which of the following ions has the electron configuration 2,8,8?

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Chemistry WAEC 2011

Which of the following ions has the electron configuration 2,8,8?

  • Na+
  • Mg2+
  • F-
  • CI- checkmark

The correct answer is: D

Explanation

Chlorine(Cl) has configuration 2,8,7 but Chlorine ion (Cl-) has 18 electrons and configuration 2,8,8.

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