When sodium and chlorine atoms come into contact, the highly electronegative chlorine atom strongly attracts the valence electron from the less electronegative sodium atom. This transfer of electrons results in the formation of positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-).
The electrostatic attraction between the positively charged sodium ions and negatively charged chloride ions holds the ionic compound together. This type of bond, where electrons are transferred from one atom to another, is known as an ionic bond.
In the case of sodium chloride (NaCl), the ionic bond is very strong due to the significant difference in electronegativity between sodium and chlorine atoms. This strong ionic bond is responsible for the characteristic properties of sodium chloride, such as its high melting and boiling points, solubility in water, and ability to conduct electricity in the molten state or when dissolved in water.
