What do the elements neon argon krypton and xenon have in common?

Answer 1

It sounds like you're listing noble gases, the members of group 18. In addition, helium and radon are members. The properties of these gases are chemically very similar to that of helium, though the physical properties, like density, change as you move up and down the group.

Answer 2

Neon, argon, krypton, and xenon are all noble gases found in Group 18 of the Periodic Table. These elements are colorless, odorless, and have low reactivity due to their full outer electron shells. They are used in various applications such as lighting, lasers, and insulation.