Xenon has an unexpectedly low abundance in the atmosphere, in what has been called the missing xenon problem; one theory is that the missing xenon may be trapped in minerals inside the Earth's crust.
Xenon er til stede i uventet lille mængde i atmosfæren, hvilket er blevet kaldet manglende xenonproblemet; en teori er, at det manglende xenon kan være indespærret i mineraler i jordskorpen.