The metallic luster exhibited by sodium is explained by (a) Diffusion of \( \mathrm{Na}^{+} \) (...

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The metallic luster exhibited by sodium is explained by
(a) Diffusion of \( \mathrm{Na}^{+} \)
(b) Oscillation of loose electrons
(c) Excitation of free protons
(d) Existence of BCC lattice
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