![]() In general, an atom’s electronegativity is. Sodium transfers one of its valence electrons to chlorine, resulting in formation of a sodium ion (with no electrons in its 3n shell, meaning a full 2n shell) and a chloride ion (with eight electrons in its 3n shell, giving it a stable octet). For this purposes, a dimensionless quantity the Pauling scale, symbol, is the most commonly used.
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