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Suppose a chemist discovers a new metallic element and names it "Xtrinsium" (Xt). Xt exhibits chemical behaviour similar to an alkaline earth. Xt(s) + Cl2(g) XtCl2(s) Lattice energy for XtCl2 -2280 kJ/mol First Ionization energy of Xt 310 kJ/mol Second Ionization energy of Xt 589...