The metallic lustre of sodium is explained by the presence of:

N a^{+}

ions

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The oscillation of loosely bound electrons

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Inert gas configuration

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BCC lattice

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Solution

The correct option is B The oscillation of loosely bound electrons
Metallic lustre of sodium is because of the oscillation of loosely bound electrons. When light falls on the surface of the metal, free electrons in the metal get excited to higher energy levels and when it returns back to the lower energy levels, it emits light.

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