Question

why are zero group elements are called noble gases or inert gases?
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Answer 1

Explanation:

The noble gases are colorless, odorless, tasteless, and nonflammable under standard conditions. They were once labeled group 0 in the periodic table because it was believed they had a valence of zero, meaning their atoms cannot combine with those of other elements to form compounds

Answer 2

Explanation:

The elements of group 0 have stable complete octate configuration. As a result, they do not react with other elements easily, i.e., they have inert behavior. Hence they are also called inert gases.