Here’s a explanation:
1. What Are Noble Gases?
- Noble gases are the elements in Group 18 of the periodic table.
- Examples: He, Ne, Ar, Kr, Xe, Rn
- They are colorless, odorless, and gases at room temperature.
2. Why Are They Unreactive?
- They have a full outer electron shell (stable configuration).
- Because their outer shell is full, they do not need to gain, lose, or share electrons.
- This makes them chemically inert under normal conditions.
3. Some Exceptions
- He, Ne, Ar → almost completely unreactive
- Xe, Kr → can form compounds with highly reactive elements like fluorine under special conditions
In short:
Noble gases = Group 18 elements with full outer shells → very unreactive (inert).