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Adparticle
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<p>An adparticle is an <a href="/facts/Atom/FoQ4kGN5">atom</a>, <a href="/facts/Molecule/N9ljSfFq">molecule</a>, or cluster of atoms or molecules that lies on a crystal surface. The term is used in <a href="/facts/Surface_chemistry/WTENdutJ">surface chemistry</a>. The word is a contraction of "<a href="/facts/Adsorption/ARH9peYM">adsorbed</a> particle". An adparticle that is a single atom may be referred to as an "<a href="/facts/Adatom/er9qH2xn">adatom</a>". </p>