Final answer:
NH3, or ammonia, has one resonance structure. The central nitrogen atom has five valence electrons and shares three bonding pairs with hydrogen atoms.
Step-by-step explanation:
The molecule NH3, which is ammonia, has one resonance structure. In the Lewis electron structure, the central nitrogen atom has five valence electrons and each hydrogen atom donates one valence electron. The nitrogen atom is assigned a total of five electrons, including a lone pair and three bonding pairs with hydrogen atoms.