Question

Which reason best explains why metals are shiny?
because their valence electrons reflect light
because their valence electrons absorb light
because their valence electrons oscillate between bands
because their valence electrons move to higher energy levels

Answer 1

Because their valence electrons reflect light.

Explanation: metals have delocalized (free) valence electrons that respond to the incoming electromagnetic field, oscillate and re‑radiate the light. That re‑radiation (high reflectivity over the visible range) gives metals their shiny, mirrorlike appearance.