The Noble Gases are unreactive - they don't do a thing. That's why they were among the last elements to be discovered and it's also where their name comes from. Nobles, such as kings and queens don't do much, they just sit there - like a noble gas. So their name is actually a joke! HAHAAHAHAHAHAHA!
By the end of this page you should be able to:
The Noble gases are found in group 8(or 0) of the periodic table, on the far right hand side. Their names are helium, neon, argon, krypton, xenon and radon. They are extremely unreactive and colourless. This is because they have a full outer shell, this is shown in the diagrams to the right. As a rule you can assume that they don't react (small fib), they cannot form bonds and therefore always exist as single atoms (monatomic).
As you go down the group the physical properties of the Noble Gases change:
This allows you to predict the properties of a Noble Gas, for example a common exam question gives you the boiling point of Helium and Argon and asks you to predict the boiling point of neon. Just pick a number roughly halfway between the two.
As the mass increases so does the number of electrons. This increases the strength of the intermolecular forces between the separate noble gas atoms, so more energy is needed to break them apart. Simples!