(C) Alkali metals possess metallic lustre when freshly cut because they contain loosely bound valence electrons (free electrons) in their metallic lat

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they contain loosely bound electrons which absorb the photons and then re-emit

(C) Alkali metals possess metallic lustre when freshly cut because they contain loosely bound valence electrons (free electrons) in their metallic lattice. These electrons absorb incident light (photons) and re-emit them,which gives rise to the characteristic metallic lustre.

Class 11 Chemistry s-Block Elements Alkali metals

Difficult

Alkali metals possess metallic lustre when freshly cut because

A
they have a hard surface and light is reflected back
B
their crystal structure contains ordered arrangement of constituent atoms
C
they contain loosely bound electrons which absorb the photons and then re-emit
D
they are obtained from the minerals on which light has been falling for years