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

Question 40 Structure of the Atom - Exercise

Why do Helium, Neon, and Argon have a zero valency?


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.

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