The size (diameter) of five elements are in the order R &lt; T &lt; W &lt; X &lt; Y, Y being the largest. If each atom has an electron situated on its circumference, and neglecting other factors, which of the atoms will lose its electron most reluctantly?

The size (diameter) of five elements are in the order R < T < W < X < Y, Y being the largest. If each atom has an electron situated on its circumference, and neglecting other factors, which of the atoms will lose its electron most reluctantly?

jamb 1978 chemistry

The correct answer is A. R

No explanation given

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