When two or more atoms combine, a competition for the available electrons can occur that leads to a nearly complete transfer of one or more electrons. The resulting formation of an ionic bond involves the removal of an electron from one atom, a process known as ionization potential of the atom. The other atom gains an electron, and the measure of its ability to do so is known as its electron affinity. An ionic bond result from the strong electrostatic forces of attraction between the negatively charged anions and positively charged cations. When atoms of sodium and chlorine are brought together, for example, tablet salt (NaCl) is formed; a more proper representation might be Na+Cl-.
For detail look in Chemical Ionic Bond
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