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The ions X- and Y are isoelectronic each contai... - JAMB Chemistry 1991 Question

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
correct option: d
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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