Question

what are lustre how it is Element in copper

Answer 1

a luster is a thick containing unoxidized metal which gives an iridecent gaze to ceramics

Answer 2

Here is your answer :

Lustre : Metals, in their pure state, have a bright shining surface. This property is called metallic lustre. Metals like gold, silver and platinum are known for their most shining surface.

Copper is a lustrous metal.