Krypton is an element, a noble gas, atomic number 36. It is one of the few noble gases to have been successfully bonded with another element; KrF2, krypton difluoride, can be produced in small quantities under extreme simulated conditions.
Date of krpton discovered
I am Soridon and krypton has 36 electrons
[Ar] 3d10 4s2 4p6
Yes, it is. The elements in group 18 are noble gases.
Krypton. It's a gas. You mostly experience it in "neon" signs, where it provides the orange-red color.
The distance between planet Krypton and Earth depends on their relative positions in space, as both planets are fictional. In the DC Comics universe, Krypton is located in a different star system than Earth, which means the distance between them would be vast and not easily measurable.