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Both the elements in water contribute to the surface tension. It is the difference in electronegativity values that causes such strong intermolecular forces. (Electronegativity is the strength of an elements pull on electrons). Since each H-O bond is polar (i.e. one end is positive and one end is negative), the overall molecule H-O-H is slightly -ve, middle and slightly +ve ends. This gives the water molecules the ability to "stick" together strongly. Leading to high surface tension.

(Previous answer was simply "Hydrogen")

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