Question

ammonia (nh₃) is a covalent compound. the nitrogen atom shares a pair of electrons with each hydrogen atom, forming three covalent bonds. bohr model of nh₃ which lewis dot structures correctly represent a molecule of nh₃?

Explanation:

In the Lewis - dot structure of ammonia ($NH_3$), nitrogen is the central atom. Nitrogen has 5 valence electrons. It forms 3 single covalent bonds with 3 hydrogen atoms (each hydrogen contributes 1 electron). After forming these bonds, nitrogen has a lone - pair of electrons remaining. The correct Lewis - dot structure should show the nitrogen atom with 3 single bonds to hydrogen atoms and a lone - pair of electrons on the nitrogen.

Answer:

The first and fourth Lewis - dot structures are correct as they show the nitrogen atom bonded to three hydrogen atoms and have a lone - pair of electrons on the nitrogen. The second and third structures are incorrect as they do not properly represent the lone - pair on the nitrogen in the correct format. So the correct options are the first and fourth structures shown in the image.