An element is a _ gas, if it has _ valence electrons.

noble

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Solution

Valence electrons: The electrons present in the outermost shell.
Except for Helium (He) which has 2 valence electrons, all the noble gases like Neon (Ne), Argon (Ar), Krypton (Kr) etc. have 8 electrons in their outermost shell or the valence shell.
Electronic configuration of Neon (Atomic number 10)= 2, 8
Electronic configuration of Argon (Atomic number 18)= 2, 8, 8
Electronic configuration of Krypton (Atomic number 36)= 2, 8, 18, 8
Therefore, an element is a noble gas, if it has 8 valence electrons.

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