s-Block ElementsHard

Question

Alkali metals possess metallic lustre when freshly cut because :

Options

A.they have a hard surface and light is reflected back.
B.their crystal structure contains ordered arrangement of constituent atoms.
C.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.

Solution

The alkali metal atoms have the largest size in a particular period of the periodic table and thus they contain loosely bound electrons which absorb the photons and then re-emit it and producing metallic lustre.

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