a very small amount of Mercury on placing over a clean glass plate form a sperical ball. short answer
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Answer:
Mercury has a much greater force of cohesion than its adhesive force with glass. Therefore, the molecule of mercury at the edge are pulled inward by inner molecules. But, the molecules don't inward as there movement is opposed by the inner molecules. this causes tension among the molecules near the edge. therefore the molecules of mercury rearrange themselves so that no unbalance force acting upon the molecules of mercury.in doing so they take a spherical shape.
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the adhesive force of mercury is greater then its cohesive force and so the mercury atoms so they attract to the clean glass plate atoms. and so they form a tiny spherical ball
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