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QUESTION

# Are the electrons in a coordinate covalent bond donated by both the bonded atoms?

In a coordinate covalent bond, the electrons are conceived to be supplied by the ONE atom............

Consider the acid-base behaviour of ammonia:

H_3N(aq) + H_2O(l) rightleftharpoons NH_4^(+) + HO^-

The lone pair on ammonia is conceived to donate electrons to form a coordinate covalent bond with the proton. Of course in ammonium ion, NH_4^+, all of the N-H bonds are equivalent, but nitrogen has a formal positive charge because its lone pair has been donated to H^+.