Question

non metals are dull but dimond is nonmetal but dimond is shiny why?

Answer 1

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Metals have a shining surface called luster when freshly prepared. They have

a quality of reflecting light from their surface and they can be polished e.g. metals likegold, silver, copper show this property.Non-metals do not have luster. They do not reflect light from their surface.( exception diamond and iodine ) Non-metals have dull appearance. For example,sulphur, phosphorus and carbon show this property.

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Answer 2

As u mentioned, all nonmetals are lustrous(dull appearance) but diamond, iodine and graphite are the exceptions in nonmetals which are not lustrous.

Hope it helps.....