NF3 Molecular Geometry

Nitrogen trifluoride(NF3) has the composition of one Nitrogen and three fluorine atoms. What is the molecular geometry of Nitrogen trifluoride?. Drawing and predicting the NF3 molecular geometry is very easy by following the given method. Here in this post, we described step by step to construct NF3 molecular geometry. Nitrogen and fluorine come from the 15th and 17th family groups in the periodic table. Nitrogen and fluorine have five and seven valence electrons respectively.

Key Points To Consider When drawing The NF3 Molecular Geometry

A three-step approach for drawing the NF3 molecular can be used. The first step is to sketch the molecular geometry of the NF3 molecule, to calculate the lone pairs of the electron in the central Nitrogen atom; the second step is to calculate the NF3 hybridization, and the third step is to give perfect notation for the NF3 molecular geometry.

The NF3 molecular geometry is a diagram that illustrates the number of valence electrons and bond electron pairs in the NF3 molecule in a specific geometric manner. The geometry of the NF3 molecule ion can then be predicted using the Valence Shell Electron Pair Repulsion Theory (VSEPR Theory) and molecular hybridization theory, which states that molecules will choose the NF3 geometrical shape in which the electrons have from one another in the specific molecular structure.

Finally, you must add their bond polarities characteristics to compute the strength of the three N-F single bonds (dipole moment properties of the NF3 molecular geometry). Two Nitrogen-fluorine single bonds in the Nitrogen trifluoride(NF3), for example, are polarised toward the more electronegative value fluorine atoms, and because all three (N-F) single bonds have the same size and polarity, their sum is nonzero due to the NF3 molecule’s bond dipole moment due to pulling the electron cloud to the three side of trigonal pyramidal geometry, and the NF3 molecule is classified as a polar molecule.

NF3 Molecular Geometry

The molecule of Nitrogen trifluoride(with trigonal pyramidal shape NF3 molecular geometry) is tilted at 97 degrees bond angle of F-N-F. It has a difference in electronegativity values between Nitrogen and fluorine atoms, with fluorine’s pull the electron cloud being greater than Nitrogen’s. But bond polarity of N-F is not canceled to each other in the trigonal pyramidal geometry. As a result, it has a nonzero permanent dipole moment in its molecular structure. The NF3 molecule has a nonzero dipole moment due to an unequal charge distribution of negative and positive charges in the trigonal pyramidal geometry.

Overview: NF3 electron and molecular geometry

According to the VSEPR theory, the NF3 molecule ion possesses trigonal pyramidal molecular geometry. Because the center atom, Nitrogen, has three N-F single bonds with the three fluorine atoms surrounding it. The F-N-F bond angle is 97 degrees in the trigonal pyramidal NF3 molecular geometry. The NF3 molecule has a trigonal pyramidal geometry shape because it contains three fluorine atoms in the geometry and four corners with one lone pair of electrons.

There are three N-F single bonds at the NF3 molecular geometry. After linking the three fluorine atoms and one lone pair of electrons on the nitrogen atom in the trigonal pyramidal form, it maintains the pyramidal-shaped structure. In the NF3 molecular geometry, the N-F single bonds have stayed in the three terminals and one lone pair of electrons on the nitrogen atom of the trigonal pyramidal NF3 molecule.

The center nitrogen atom of NF3 has one lone pair of electrons, resulting in trigonal pyramidal NF3 electron geometry. However, the molecular geometry of NF3 looks trigonal pyramidal and has one lone pair of electrons on the nitrogen of the NF3 geometry. It’s the NF3 molecule’s symmetrical geometry. As a result, the NF3 molecule is polar.

How to find NF3 hybridization and molecular geometry

Calculating lone pairs of electrons on nitrogen in the NF3 geometry:

  1. Determine the number of lone pairs of electrons in the core nitrogen atom of the NF3 Lewis structure. Because the lone pairs of electrons on the nitrogen atom are mostly responsible for the NF3 molecule geometry planar, we need to calculate out how many there are on the central nitrogen atom of the NF3 Lewis structure.

Use the formula below to find the lone pair on the nitrogen atom of the NF3 molecule.

L.P(P) = V.E(P) – N.A(N-F)/2


Lone pair on the central nitrogen atom in NF3 = L.P(P)

The core central nitrogen atom’s valence electron in NF3 = V.E(P)

Number of N-F bonds = N.A (N-F)

calculation for nitrogen atom lone pair in NF3 molecule.

For instance of NF3, the central atom, nitrogen, has five electrons in its outermost valence shell, three N-F single bond connections. This gives a total of three connections.

As a result of this, L.P(P) = (5 –3)/2=1

The lone pair of electrons in the nitrogen atom of the NF3 molecule is one.

Calculating lone pair of electrons on fluorine in the NF3 geometry:

Finding lone pair of electrons for the terminal fluorine atom is not similar to the central nitrogen atom. We use the following formula as given below

Use the formula below to find the lone pair on the fluorine atom of the NF3 molecule.

L.P(F) = V.E(F) – N.A(N-F)


Lone pair on the terminal fluorine atom in NF3= L.P(F)

Terminal fluorine atom’s valence electron in NF3= V.E(F)

Number of N-F bonds = N.A ( N-F)

calculation for fluorine atom lone pair in NF3 molecule.

For instance of NF3, their terminal atoms, fluorine, have seven electrons in their outermost valence shell, one N-F single bond connection. This gives a total of three-F single bond connections. But we are considering only one connection for the calculation.

As a result of this, L.P(F) = (7 –1)=6

The lone pair of electrons in the fluorine atom of the NF3 molecule is six. Three fluorine atoms are connected with the central nitrogen atom.

In the NF3 electron geometry structure, the lone pair on the central nitrogen atom is one, lone pairs of electrons in the fluorine atom have six. Three fluorine atoms have 18 lone pairs of electrons.

It means there are one lone pair of electrons in the core nitrogen atom. One lone pair of electrons on the central nitrogen atom is responsible for the trigonal pyramidal nature of NF3 molecular geometry. But in the structure fluorine atoms are polarised sidewise in their trigonal pyramidal geometry.

The one lone pair of electrons are placed at the top of the NF3 geometry. Because the nitrogen atom is a lower electronegative value as compared with other atoms in the NF3 molecule. Three fluorine atoms are polarized towards the sidewise in the NF3 structure.

But in reality, the NF3 has one lone pair of electrons in its structure. This makes the NF3 more asymmetrical in the structure of the molecule. Because there is electric repulsion between bond pairs and lone pairs. But some sort of interaction is there between fluorine lone pairs and bond pairs. But it is negligible in the ground state.

But in the central, nitrogen atom has one lone pair of electrons and these lone pair electrons just oppose each other with nitrogen- fluorine bond pairs.

Calculate the number of molecular hybridizations of the NF3 molecule

What is NF3 hybridization? This is a very fundamental question in the field of molecular chemistry. All the molecules are made of atoms. In chemistry, atoms are the fundamental particles. There are four different types of orbitals in chemistry. They are named s, p, d, and f orbitals.

The entire periodic table arrangement is based on these orbital theories. Atoms in the periodic table are classified as follows:

s- block elements

p- block elements

d-block elements

f-block elements

Atoms are classified in the periodic table

NF3 molecule is made of one nitrogen, three fluorine atoms. The fluorine and nitrogen atoms have s and p orbitals. Fluorine comes as the first element from the halogen family in the periodic table. The nitrogen atom also belongs to the nitrogen family group. But it falls as the first element in the periodic table.

When these atoms combine to form the NF3 molecule, its atomic orbitals are mixed and form unique molecular orbitals due to hybridization.

How do you find the NF3 molecule’s hybridization? We must now determine the molecular hybridization number of NF3.

The formula of NF3 molecular hybridization is as follows:

No. Hyb of NF3= N.A(N-F bonds) + L.P(P)

No. Hy of NF3 = the number of hybridizations of NF3

Number of N-F bonds = N.A (N-F bonds)

Lone pair on the central nitrogen atom = L.P(P)

Calculation for hybridization number for NF3 molecule

In the NF3 molecule, nitrogen is a core central atom with three fluorine atoms connected to it. It has one lone pair of electrons on nitrogen. The number of NF3 hybridizations (No. Hyb of NF3) can then be estimated using the formula below.

No. Hyb of NF3= 3+1=4

The NF3 molecule ion hybridization is four. The nitrogen and fluorine atoms have s and p orbitals. The sp3 hybridization of the NF3 molecule is formed when one s orbital and three p orbitals join together to form the NF3 molecular orbital.

Molecular Geometry Notation for NF3 Molecule :

Determine the form of NF3 molecular geometry using VSEPR theory. The AXN technique is commonly used when the VSEPR theory is used to calculate the shape of the NF3 molecule.

The AXN notation of NF3 molecule is as follows:

The central nitrogen atom in the NF3 molecule is denoted by the letter A.

The bound pairs (three N-F bonds) of electrons to the core nitrogen atom are represented by X.

The lone pairs of electrons on the central nitrogen atom are denoted by the letter N.

Notation for NF3 molecular geometry

We know that nitrogen is the core atom, with two electron pairs bound (three N-F) and one lone pair of electrons. The general molecular geometry formula for NF3 is AX3N1.

According to the VSEPR theory, if the NF3 molecule ion has an AX3N1 generic formula, the molecular geometry and electron geometry will both be trigonal pyramidal forms.

Name of MoleculeNitrogen trifluoride
Chemical molecular formulaNF3
Molecular geometry of NF3Trigonal pyramidal
Electron geometry of NF3Trigonal pyramidal
Hybridization of NF3sp3
Bond angle (F-N-F)97º degree
Total Valence electron for NF326
The formal charge of NF3 on nitrogen0

Summary:

In this post, we discussed the method to construct NF3 molecular geometry, the method to find the lone pairs of electrons in the central nitrogen atom, NF3 hybridization, and NF3 molecular notation. Need to remember that, if you follow the above-said method, you can construct the NF3 molecular structure very easily.

What is NF3 Molecular geometry?

NF3 Molecular geometry is an electronic structural representation of molecules.

What is the molecular notation for NF3 molecule?

NF3 molecular notation is AX3N1.

The polarity of the molecules

The polarity of the molecules are listed as follows

Lewis Structure and Molecular Geometry

Lewis structure and molecular geometry of molecules are listed below

External Reference:

Information on nitrogen trifluoride(NF3)

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