Question

what are valence electrons? give 2 examples to explain how it helps in finding valence of an atom​

Answer 1

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here is your anwer mate :-

valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

example :-

hydrogen (H), lithium (Li), and sodium (Na). Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons)..

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