$\begin{array}{1 1}Both\; Xe\; and\; O_2\; have\; the\; same\; size \\ Both\; Xe\; and \;O_2\; have\; almost \;the\; same \;ionization \;enthalphy \\ Both \;Xe\; and \;O_2\; are\; gases \\Both\; Xe\; and\; O_2\; have\; the\; same\; electron\; gain\; enthalphy \end{array}$