Question

Which of the following is the correct Lewis structure for ammonia (NH3)? Note: Hydrogen and nitrogen have one and five valence electrons respectively.

Answer 1

Three hydrogen will provide three valence electrons and nitrogen has five valence electrons all in all they 8 valence electron
**
H*«N«*H=NH3
«*
H

Answer 2

Answer : Ammonia has molecular formula as $NH_{3}$

It has a central atom as Nitrogen bonded with 3 molecules of hydrogen around it, Nitrogen has atomic number 7

The electronic configuration of N is $1s^{2} 2s^{2} 2p^{3}$

The number of valence electrons are 5 in the outermost shell of nitrogen.

According to the octet rule, it needs 3 electrons to be an octet.

So, the valency of N is 3. And, Hydrogen has the valency as 1.

Therefore, three hydrogen are needed to be a stable compound of $NH_{3}$.

The lewis structure of $NH_{3}$ is attached in the answer.

In the attached figure, the electrons of N are shown in dot and the electrons of H are shown in x.