Multiple choice

The luster of the metals is because of _____.

  1. high density, due to closed packing of atoms

  2. high polish

  3. reflection of light due to the presence of free electrons

  4. absorption of light due to the presence of cavities
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The metallic luster (shine) is caused by free electrons in the metal that reflect light. When light strikes the metal surface, these delocalized electrons vibrate and re-emit the light, creating the characteristic shine. This property is related to electrical and thermal conductivity of metals.

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