When electrons are transferred from one atom to another, and the two atoms unite as a result of the opposite charges, a(n) is formed.

ionic compound

Explanation:

An ionic compound is formed when one element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and forms a positively charged ion called as cation. The element which accepts the electrons is known as electronegative element and forms a negatively charged ion called as anion.

For formation of sodium chloride:

Electronic configuration of sodium:

Sodium atom will loose one electron to gain noble gas configuration and form sodium cation with +1 charge.

Electronic configuration of chlorine:

Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.

The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic compound.

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