<P> The xenon fluorides are good fluorinating agents . </P> <P> Clathrates have been used for separation of He and Ne from Ar, Kr, and Xe, and also for the transportation of Ar, Kr, and Xe . (For instance, radioactive isotopes of krypton and xenon are difficult to store and dispose, and compounds of these elements may be more easily handled than the gaseous forms .) In addition, clathrates of radioisotopes may provide suitable formulations for experiments requiring sources of particular types of radiation; hence . Kr clathrate provides a safe source of beta particles, while Xe clathrate provides a useful source of gamma rays . </P>

Name an element of group 18 which can form compound