How many elements did William ramsay and Morris travers find?

William Ramsay and Morris Travers discovered a total of five noble gases: neon, argon, krypton, and xenon, along with the heavier element radon. Their work in the late 19th century was pivotal in identifying these elements and contributing to the understanding of the Periodic Table. Ramsay's investigations into the properties of these gases helped establish the noble gases as a distinct group.