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Element (X) and (Y) belongs to same period in modern periodic table. Group number of (Y) is one unit more than the group number of (X) . X^-2 and Y^-1 are isoelectronic pair . wrong statement among the following is

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X and Y may have same number of neutrons

X and Y may have different number of neutrons

Difference in their atomic numbers must be equal to 1

X and Y must have same number of nucleons

answer is D.

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Number of neucleons may or may not be equal.

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