Science, Maths & Technology
Noble gases
...University Chemistry qualification. Video Text version Here are five of the six noble gases: helium, neon, argon, kypton and xeon. They're all colourless and transparent. Krypton and xeon form compounds only with difficulty. Helium, neon and argon don't form compounds at all. As we descend the group in the periodic table the atomic number and relative atomic mass...