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The melting point of a metal nanoparticle compared with the bulk metal is

  • A.higher for metals and lower for semiconductors
  • B.lower
  • C.higher
  • D.the same

Answer: B

Surface atoms are less strongly bound than interior ones, and the smaller the particle the larger their share, so less energy is needed to disrupt the lattice. Gold particles a few nanometres across melt hundreds of degrees below bulk gold.

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