We are asked to predict the distance in the XY_{2} molecule.

$\overline{){\mathbf{X}}{\mathbf{-}}{\mathbf{Y}}{\mathbf{}}{\mathbf{bond}}{\mathbf{}}{\mathbf{length}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}{\mathbf{X}}{\mathbf{}}{\mathbf{radius}}{\mathbf{}}{\mathbf{+}}{\mathbf{Y}}{\mathbf{}}{\mathbf{radius}}}$

Hypothetical elements X and Y form a molecule XY_{2}, in which both Y atoms are bonded to atom X (and not to one another). The X–X distance in the elemental form of X is 2.04 Y–Y and the Y distance in elemental Y is 1.68 Y–Y. What would you predict for the distance in the XY_{2} molecule?

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