The metallic luster exhibited by sodium is explained by:(A) Diffusion of sodium ions(B) Oscillation of mobile valence electrons(C) Existence of free protons

(D) Existence of body centred cubic lattice

The metallic luster exhibited by sodium is explained by: (B) Oscillation of mobile valence electrons.
When light falls on metals such as sodium, the free electrons start oscillating at their mean positions and get excited to higher levels. On returning back to lower levels, they emit light which spreads in all directions. Due to this metals have a characteristic metallic lustre.

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