Noble gases are a special group of elements found in Group 0 of the periodic table. They are known for being very stable because of how their electrons are arranged.

1. Full Outer Shells:

   • Noble gases have outer electron shells that are completely filled. Here are some examples:
     • Helium (He): 1s²
     • Neon (Ne): 2s² 2p⁶
     • Argon (Ar): 3s² 3p⁶
     • Krypton (Kr): 4s² 4p⁶

2. Stable Electron Setup:

   • These setups usually have eight electrons in the outer shell, which is called the octet rule.
   • The only exception is helium, which is stable with just two electrons.

3. Low Reactivity:

   • Because their outer shells are full, noble gases don’t really want to gain, lose, or share electrons. That's why they hardly react with other elements.
   • This low reactivity makes noble gases useful for things like lighting up neon signs and providing safe environments for chemical reactions.

In short, noble gases are stable and don’t react much because of the way their electrons are arranged.