What are two elements that would have properties similar to xenon?
helium and neon
Helium, neon, and xenon are in the same group, which are the noble gases (group 18/VIIIA). All of the atoms of the noble gases have filled valence shells--two valence electrons for helium, and eight valence electrons for the rest. This makes them very non-reactive, which is a hallmark of the noble gases.