The polarity of the given molecules: BeCl₂, O₂ non-polar, H₂O polar.
BeCl₂ has a geometry that is linear. Because Be and Cl have different electronegativities, the shared pair of electrons between the two atoms are not evenly distributed—they are more skewed toward Cl, making the Be-Cl bond polar. Be-Cl on the opposite end cancels the polarity caused by one Be-Cl on one end. As a result, the whole molecule is non-polar.
The shape of H₂O is bent. O-H bonds are polar because shared electrons are more skewed toward O because O is more electronegative than H. Because the geometry prevents the polarity from being canceled, the molecule as a whole is polar.
O₂ has a linear shape. Since the electronegativity of both O's is the same, the O=O bond and molecule are non-polar.
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