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<p> The surface is energetically unfavorable when the cluster is small, because the energy gained by decreasing the concentration of dissolved particles is not as high as the energy lost from creating a new surface.  When the cluster reaches a certain size, known as the <a href="page.php?w=critical_radius">critical radius</a>, it becomes energetically favorable, and thus stable enough to continue to grow.  This nucleus then remains in the system and grows as more silver atoms diffuse through the solution and attach to the surface  When the dissolved</p><p>
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