The ions X- and Y+ are isoelectronic, each containing a total of 10 electrons. How…

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Chemistry JAMB 1991

The ions X– and Y+ are isoelectronic, each containing a total of 10 electrons.
How many protons are in the nuclei of the neutral atoms of X and Y respectively?

  • 10 and 10
  • 9 and 9
  • 11 and 9
  • 9 and 11 checkmark

The correct answer is: D

Explanation

X- means one excess electron, hence 9 protons while Y +/- means one deficit electron hence 11 protons X and Y = 9 and 11
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