Metallic luster is due to:

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High density of metals

High polish on the surface of metals

Reflection of light by mobile electron

Chemical inertness of metals

answer is C.

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Detailed Solution

Concept- Lustre in mineralogy describes how light is reflected on the face of the mineral. It's one of the parcels mineralogists
Essence has lots of free electrons. These electrons as negatively charged form pall in an invariant background of positive charge forming a largely concentrated tube. A tube is just a thickness of charge patches and the distribution of the charge within its volume can be changed by applying an external electromagnetic( EM) field. In the absence of any external EM field, the charges in the tube are slightly distributed within the essence. So, there are regions within essence that are negatively charged. Therefore, incoming light creates an oscillating EM surge on the face of the essence and disturbs the tube.
Metallic luster is due to the reflection of light by mobile electrons.
Hence, the correct option is 3.

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