The metallic lustre exhibited by sodium is explained by :

diffusion of sodium ions

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oscillation of mobile valence electrons

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existence of free protons

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existence of body centered cubic lattice

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Solution

The correct option is B oscillation of mobile valence electrons
Alkali metals are silver colored and their lustre tarnishes in air due to oxidation. Sodium has a distinctive flame colors because their outer $^{'} s^{'}$ electron is very easily excited.

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