The question is incomplete, the complete question is shown in the image attached.
The largest specie among the listed options for hypothetical element X is X^2-
We must note that when electrons are added to a neutral atom, the electron cloud expands and the anion is larger than the neutral atom. The size of the anion increases as more electrons are added (magnitude of negative charge increases)
On the other hand, a positive ion is smaller than its corresponding neutral atom. As the magnitude of positive charge increases, the ion becomes smaller in size.
Hence, the specie X^2-, is the largest specie among the options.
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