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

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.

Answer 2

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