Discussion
A particle of diameter 5 nm in a lattice of spacing 0.25 nm is about how many atoms across?
Answer: C
Correct answer: 20
\[ \frac{5\ \mathrm{nm}}{0.25\ \mathrm{nm}} = 20\ \mathrm{atoms}. \] Twenty atoms across is small enough that the outermost shell holds a substantial fraction of the total - roughly a quarter - which is why particles of this size behave so differently from bulk material of the same composition.
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