Discussion
Gold at the nanoscale becomes an active catalyst although bulk gold is inert because the
Answer: C
Correct answer: surface atoms are coordinatively unsaturated
An atom in the bulk is surrounded on all sides and has nothing left to bond with. An atom at a corner or an edge of a small particle has neighbours missing, so it retains reactivity, and in a two-nanometre particle a large fraction of the atoms are in that position. The gold is chemically the same; it is the coordination that has changed.
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