Electronegativity:
* Sodium (Na) has a low electronegativity, meaning it has a weak attraction for electrons.
* Chlorine (Cl) has a high electronegativity, meaning it has a strong attraction for electrons.
Stable Electron Configuration:
* Sodium has one valence electron in its outermost shell. Losing this electron would leave it with a full outer shell, making it stable like the noble gas Neon.
* Chlorine has seven valence electrons in its outermost shell. Gaining one electron would complete its outer shell, making it stable like the noble gas Argon.
The Transfer:
When sodium and chlorine atoms come close, chlorine's strong attraction for electrons pulls the single valence electron from sodium. This transfer results in:
* Sodium ion (Na+): Sodium loses an electron, becoming a positively charged ion.
* Chloride ion (Cl-): Chlorine gains an electron, becoming a negatively charged ion.
Ionic Bond Formation:
The oppositely charged ions, Na+ and Cl-, are then attracted to each other through an electrostatic force, forming an ionic bond. This bond results in the formation of sodium chloride (NaCl), commonly known as table salt.
In summary:
The transfer of an electron from sodium to chlorine is driven by the difference in electronegativity, with chlorine's stronger attraction for electrons enabling it to "steal" the electron from sodium. Both atoms then achieve stable electron configurations, resulting in the formation of an ionic bond.
