do krypton join with other element to create common compound ?

Krypton (Kr) is a noble gas, which means it is generally unreactive due to its full valence shell, making it stable and unlikely to form compounds readily under normal conditions. Noble gases tend to exist as single atoms rather than forming chemical bonds with other elements.

However, contrary to expectations based on their historical classification as completely inert, scientists have discovered that under extreme conditions, noble gases can form compounds. Krypton has formed a few compounds, although they are extremely rare and unstable. One example is krypton difluoride (KrF2), which requires extremely low temperatures and high pressures to synthesize and maintain stability.

So, while it's correct to say that krypton does not commonly form compounds, there are exceptional circumstances where it has been observed to do so, albeit in very specialized laboratory settings and not in everyday natural occurrences.