As we have learnt, Octet rule is based upon chemical inertness of noble gases. Since the number of
outermost electrons influences the chemical behavior of an atom, the number of eight so-called valence electrons (or two in the case of helium) means a particularly stable electron occupation. Based on the noble gases with their eight valence electrons (exception: helium), the effort to achieve the noble gas configuration is also called the octet rule.
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shivangi.bhatnagar