Noble gases are special because of their unique electron setups and how they behave in the periodic table. Here are some important points to understand:

1. Electron Setup:
   Noble gases are found in Group 18 of the periodic table. They have a full outer layer of electrons. Here are some examples:

   • Helium (He): has 2 electrons in its outer shell.
   • Neon (Ne): has 10 electrons, with 8 in its outer shell.
   • Argon (Ar): has 18 electrons, with 8 in its outer shell as well.

2. Reactivity:
   Because they have stable electron arrangements, noble gases do not react easily with other elements. This means they don’t form compounds like many other elements do when they try to become stable.

3. Physical Properties:
   Noble gases share some interesting features:

   • They have very low boiling points. For example, Helium boils at -269°C and Radon at -186°C.
   • They are colorless, odorless, and tasteless.

4. Trends in the Periodic Table:
   As you go from Helium to Radon, the atomic number increases. This means their atomic mass and boiling points also go up, showing a pattern in their physical properties.

These special traits make noble gases stand out in the periodic table of elements.