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When the two atoms are in contact, potassium readily transfers its outer electron to chlorine which readily accepts it, resulting in both atoms achieving a state of eight outermost electrons. With this electron transfer, the ionic bond in KCl is formed. A transfer of electrons occurs when fluorine and calcium react to form an ionic compound. This is because calcium is in group two and so forms ions with a two positive charge. Instead, the outermost energy levels overlap and they share electrons. A pairs of shared electrons makes one covalent bond. Formation of Negative Ion: After fluorine gains the electron from sodium, it becomes a negatively charged ion. (9 p + 10 e- = -1). The ionic bond between ions results from the electrostatic attraction of opposite charges. The final formula of sodium fluoride is NaF.

Explanation:

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