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Explain how the elements combine to form an ionic compound. The two group are group 1(alkali metals), and group 15 (nitrogen group)

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Ionic bonding occurs as a result of an electron exchange.  Most atomic nuclei do not posses a stable electronic configuration in their outer orbits; they either have an excess or deficiency.  Those with an excess are likely to combine with those with a deficiency so that both atoms have a more stable configuration.  However, in moving an electron from one to the other, both atoms become electrically charged, each forming an ion -- One becomes positive, and the other becomes negative.  These opposing charges attract, and keep the atoms together, forming a compound.

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