Which of these statements about nanoscale material properties is NOT true?

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1. Which of these statements about nanoscale material properties is NOT true?

Gold appears red at the nanoscale

Copper becomes transparent at the nanoscale

Silicon becomes an insulator at the nanoscale

Aluminium becomes highly combustible at the nanoscale

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Silicon remains a semiconductor at the nanoscale, not an insulator — though its optical and electronic properties do shift due to quantum confinement effects.