Question

Why Are Noble Gases Non-Reactive?

Answer 1

Hint :Noble gases are the elements which belong to the group eighteen of the modern periodic table. They are called noble gases because of their inert nature as they are chemically non-reactive or show very low reactiveness. At room temperature and pressure, they exist as colorless, odourless and monatomic gases.

Complete Step By Step Answer:
We know that there are seven periods (horizontal rows) and eighteen groups (vertical columns) in the modern periodic table. Noble gases are the elements that belong to group eighteen of the periodic table.
They are colorless and odourless in nature and exist as monatomic gases at room temperature and pressure conditions.
Now, they are very low- reactive or not at all reactive gases because of their electronic configuration.
The general electronic configuration of noble gases is $ n{s^2}n{p^6} $ . So, when we see the valence or outermost orbitals according to this electronic configuration:
The s-orbital can contain a maximum of two electrons which are already present while the p-orbital can contain a maximum six electrons which are present in it. So, we can see that the outermost orbitals of the noble gases are completely filled and hence, this makes them inert or non-reactive in nature.

Note :
Different noble gases have different applications such as helium is used to fill balloons and airships. Argon is used as filler in light bulbs. Neon is used in advertisement boards. Krypton is used in lasers for eye surgery and the car headlights and xenon is also used in car headlights, lighthouse lights, etc.