The chemical reaction na+ + cl- nacl is best described as a(n)
decomposition reaction
exchange reaction
reversible reaction
synthesis reaction

The correct answer is:

synthesis reaction

Explanation:

A combination reaction or direct incorporation reaction is a type of chemical reaction in which two or more simple materials combine to form a more intricate product. The reactants may be elements or compounds. The product is always an aggregate.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

the answer would be c