In the reaction NH3 + H+ → NH4+, the bond formed results from?

A.

an electron transferred from NH3 + H+

B.

an electron pair donated by NH3

C.

an electron pair equally shared

D.

an electron pair donated by H+

E.

an electron tarnsferred from H+ to NH3

Correct answer is B

The nitrogen atom has a lone pair of electrons that coordinates to the hydrogen cation, which has zero electrons, forming a covalent bond.