A cation and an anion slowly move towards each other. What happens to the strength of the electrostatic force between them?

A cation and an anion slowly move towards each other. What happens to the strength of the electrostatic force between them?
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The Strength is increased and and Ionic bond is formed.An Ionic bonds involve a cation and an anion. The bond is formed when an atom, typically a metal, loses an electron or electrons, and becomes a positive ion, or cation. Another atom, typically a non-metal, is able to acquire the electron(s) to become a negative ion, or anion.One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom. In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it. The ions produced are oppositely charged and are attracted to one another due to electrostatic forces.
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