Biology / Bio 0133 · Atom · ~20 seconds
Polar Covalent Bonds
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A polar covalent bond shares electrons unevenly between two atoms, because one pulls them closer than the other.
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In a water molecule, oxygen pulls the shared electrons closer than hydrogen does, leaving oxygen slightly negative and each hydrogen slightly positive.
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A polar bond still shares electrons — unevenness is a matter of degree, not a switch to an ionic bond.