The group of noble gas elements is called zero group. Why ?

1.	The group of noble gas elements is called zero group. Why ?
Answer» With the exception of helium `(1s^(2))`, all other noble gas elements have `ns^(2)p^(6)` electronic configuration. Thus, they have highly symmetrical configuration and therefore, donot form compounds undr ordinary conditions. In other words they show zero valency and are included in the zero group of the periodic table.

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The group of noble gas elements is called zero group. Why ?

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