Alkali metals possess metallic lustre when freshly cut because:

they have a hard surface and light is reflected back

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their crystalline structure contains ordered arrangement of constituent atoms

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

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they are obtained from the minerals on which light has been falling for years

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Solution

The correct option is B they contain loosely bound electrons which absorb the photons and then re-emit
Alkali metals possess metallic lustre when freshly cut because they contain loosely bound metallic bond free electrons which reacts with sun light (absorb the photons and then re-emit).

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Alkali metals possess metallic lustre when freshly cut because:

The correct option is B they contain loosely bound electrons which absorb the photons and then re-emitAlkali metals possess metallic lustre when freshly cut because they contain loosely bound metallic bond free electrons which reacts with sun light (absorb the photons and then re-emit).

The correct option is B they contain loosely bound electrons which absorb the photons and then re-emit
Alkali metals possess metallic lustre when freshly cut because they contain loosely bound metallic bond free electrons which reacts with sun light (absorb the photons and then re-emit).