Why do Helium Neon and Argon have a zero valency...

Question

Why do Helium Neon and Argon have a zero valency

Accepted Answer

Helium has 2 electrons in its outermost orbit thus filling shell 1 and forming duplet configuration in the valence shell Neon has 8 electrons in their valence orbit hence completing duplet configuration In the same way Argon and Neon have 8 electrons in its outermost shelling completing octet configuration These elements have a maximum electron in their valence shell thus reach stable electron configuration and they will not take part in any sort of chemical reaction

NCERT Exemplar Solutions Class 9 Science Solutions for Structure of the Atom - Exercise in Chapter 4 - Structure of the Atom