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The silvery luster of alkali metals is due to the presence of highly mobile electrons of the metallic lattice.. plz explain

 The silvery luster of alkali metals is due to the presence of highly mobile electrons of the metallic lattice.. plz explain

Grade:12th pass

1 Answers

Bhavya
askIITians Faculty 1281 Points
6 years ago
The bright luster of metals is due to presence of delocalised mobile electrons.
When light falls on the surface of the metal, the loosely held electrons absorb photons of lights.They get promoted to higher energy levels (excited state), oscillating at a frequency equal to that of the incident light.
These oscillating electrons readily return from the higher to the lower levels of energy by releasing energy, thus becoming a source of light radiations.
Light appears to be reflected from metal surface and the surface acquires a shining appearance, which is known as metallic luster.

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