The ionic bond is a bond between ions of opposite sign. These ions are formed by atoms having electronegativity difference greater than the conventional 1.9: In these conditions, when two atoms approach (a metal and an atom of an element of the last groups), the electrons in the outermost level of the atom less electronegative spend more electronegative atom. This then becomes a negative ion, while the other atom becomes an ion positivo.Questo binding is purely electrostatic, the arrangement of atoms in space is not the directionality of the covalent bond: the electric field generated by each ion is spreads symmetrically in the space around it.
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