Krypton is not a metal, so therefore, it is not shiny or dull. It is a noble gas, and it's colorless and odorless.
a nonmetal because a metal is shiny and strong so a nonmetal is brittle and dull
dull
Shiny
Krypton is an element.
dull
dull
dull
dull
It is shiny.
Shiny
Shiny