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

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?
  • A. 10 and 10
  • B. 9 and 9
  • C. 11 and 9
  • D. 9 and 11
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Correct Answer: Option 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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