Metallic lustre is explained by :

oscillation of loose electrons

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diffusion of metal ions

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excitation of free protons

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existence of B.C.C. lattice

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Solution

The correct option is A oscillation of loose electrons
The metallic lustre of a metal is due to the oscillation of loosely bound electrons.

When light falls upon the electrons, they absorb energy and are set into oscillation, and they emit radiations which are responsible for the metallic lustre.

Hence, te correct option is $A$

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Sodium metal crystallizes in B.C.C lattice with edge length of $4.29 ˙ A$ . The radius of sodium atom is

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