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Why do noble gases have zero valency?
Answers (1)
Valency is defined by the number of electrons an element may lose, gain, or share to attain a stable electronic configuration, i.e., combining capacity of an atom. The noble gases are located in Group 18 of the periodic table and have a fully occupied outermost electron shell (octet or duplet for helium). Electronic configuration of some group 18 atoms- $$
\text{Helium (He)} \rightarrow 2 ;
\text{Neon (Ne)} \rightarrow 2,8 ;
\text{Argon (Ar)} \rightarrow 2,8,8
$$
The reasons why noble gases have zero valency are as follows:
- Complete Outer Shell- Noble gases possess a fully occupied valence shell.
- Stable- Electrons do not require gain or loss. They are already stable.
- Lack of Bonding Affinity- No unpaired electrons are present for the formation of bonds.
- Inert Nature- They remain unreactive under standard settings.
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