Question

NF3 is possible , but NF5 is not , Why ?​

Answer 1

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❥The valency of nitrogen is 3. It has 5 electrons in its outer most orbit,but take a look at the electronic configuration .

❥It has 3 electrons in 2p orbital. Since there is no vacant 2d orbital (which is also not possible,it does not exist) to complete it's octet , that means to expand so N can only form NF3 not NF5.

Answer 2

Nitrogen does not have d orbital.

Explanation:

Nitrogen is an element which belong to the Group number which is 15.

Electronic configuration of nitrogen atom: $1s^22s^22p^5$

Nitrogen atom does not have a d-orbital around it.

Formula used to calculate the number of atomic orbitals around central metal atom is:

Hybridization of nitrogen in $NF_5$

Number of bond pairs = 5

Number of lone pairs = 0

Number of atomic orbitals around Nitrogen atom = 5 + 0 = 5

So, hybridization will be $sp^3d$. It is visible that the nitrogen atom does not have any d-orbitals, therefore this hybridization is not possible and hence, this compound is not possible. Thus, it is an unstable molecule.

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