ionic bond

An ionic bond (or electrovalent bond) is a type of chemical bond based on electrostatic forces between two oppositely-charged ions. In ionic bond formation, a metal donates an electron, due to a low electronegativity, to form a positive ion or cation. In ordinary table salt (NaCl), the bonds between the sodium and chloride ions are ionic bonds. Often ionic bonds form between metals and non-metals. The non-metal atom has an electron configuration just short of a noble gas structure. They have high electronegativity, and so readily gain electrons to form negative ions or anions. The two or more ions are then attracted to each other by electrostatic forces.
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The combination of an atom that has a strong tendency to lose electrons with an atom that has a strong tendency to gain electrons, such that the former transfers one or more electrons to the latter and each achieves chemical stability under the octet rule. The atom that loses electrons acquires a positive electric charge and the atom that gains electrons acquires a negative electric charge, so that - the resulting compound is electrically neutral.

Compare with covalent bond .An attraction between ions of opposite charge. Potassium bromide consists of potassium ions (K+) ionically bound to bromide ions (Br-). Unlike covalent bonds, ionic bond formation involves transfer of electrons, and ionic bonding is not directional.

Noun
1. a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion
(synonym) electrovalent bond, electrostatic bond
(hypernym) chemical bond, bond