Define the following
Noble gas

Explanation

### Step-by-Step Solution:

1. **Definition of Noble Gas**:
Noble gases are a group of chemical elements that are characterized by their lack of reactivity due to having a complete valence shell of electrons. This makes them stable and unlikely to form chemical bonds with other elements.

2. **Location in the Periodic Table**:
Noble gases are found in Group 18 of the periodic table. This group includes the elements helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

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