We are asked to predict the distance in the XY2 molecule.
Hypothetical elements X and Y form a molecule XY2, 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 XY2 molecule?
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