Why do the elements of noble gases usually not form ions?

So, for noble gases, they already have their outermost shells filled completely so they need not donate or accept any electrons. For example: Argon has atomic no 18 ,i.e E.C = 2,8,8. They are already stable. So, they don't need to form ions.

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Their outer shell (that has electrons) is already filled.

Explanation:

Basically they have no need to gain or lose any electrons because they have enough. That is why noble gases are considered to be basically non-reactive.

it is called kinetic energy