BF3, also known as Boron Trifluoride, is an inorganic chemical compound which is a colorless gas with a pungent smell.

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Students frequently get confused about the polarity or non-polarity the BF3 (Boron Trifluoride) due to the existence of three Fluorine atom which have actually a very high electronegativity worth when compared to the Boron atom.

So, is BF3 polar or non-polar? BF3 (Boron Trifluoride) is Non-Polar since of its highly symmetric shape. It has a Trigonal Planar geometry i beg your pardon cancels out the dipole moment of the three BF bonds making the resultant Dipole minute of the compound equal to 0 (Zero).

Let’s try to know this in part detail. To answer ours question, we will analyze miscellaneous factors, responsible because that polarity, v respect come BF3.

Molecular framework of BF3 (Boron Trifluoride)

The BF3 (Boron Trifluoride) molecule has 1 atom the B (Boron, atomic no: 5) and also 3 atom of F (Fluorine, atomic no: 9). The valency of B (Boron) is 3 and of F (Fluorine) is 7, thus the Lewis structure of BF3 deserve to be attracted as shown in the figure:


We can see that each F (Fluorine) atom has actually 3 lone bag of electrons therefore the molecular structure is balanced and symmetric.

According to the VSEPR (Valence shell Electron Pair Repulsion) Theory, the BF3 (Boron Trifluoride) molecule has a Trigonal planar geometry v each F-B-F bond angle same to 120 degrees which again adds to the balance the the molecule do it very symmetric, as shown:


Electronegativity & link Polarity the BF3 (Boron Trifluoride)

In BF3 (Boron Trifluoride) molecule there room three bond of B-F, as shown clearly in Lewis chart above.

The electronegativity that B (Boron) is 2.04 and of F (Fluorine) is 3.98 (maximum) follow to the Pauling range which way that F (Fluorine) will certainly pull the common electrons in the direction of itself and will thus obtain a partial an unfavorable charge (δ-) and B (Boron) will have a partial confident charge (δ+).

To recognize if a shortcut is polar or not we must find out the difference in between the electronegativity values of the 2 atoms share a bond.

The difference in between the electronegativity values of B and also F is same to 1.94 (3.98 – 2.04 = 1.94) i m sorry is greater than 0.5.

Thus, every B-F bond in BF3 (Boron Trifluoride) molecule is polar. It way that the electrons room not mutual equally through the two atoms (B and also F) rather they space pulled towards F (Fluorine).

However, we should keep in mind that bond polarity is various from as whole molecule polarity. The link polarity doesn’t always an outcome in all at once molecular polarity.

Dipole minute of BF3 (Boron Trifluoride)

The 3 bonds of B-F in BF3 (Boron Trifluoride) room polar (as questioned above) and also thus they have a link dipole minute as displayed below:


But the extremely symmetrical structure and also geometry that BF3 (Boron Trifluoride), as discussed earlier, allows the shortcut dipole moments to be canceled such that the resultant Molecular Dipole moment is equal to 0 (Zero).

Thus, do the molecule BF3 (Boron Trifluoride) together Non-Polar.

Now, we know that the Non-Polarity of BF3 (Boron Trifluoride) is as result of its highly symmetrical Trigonal Planar geometry, as predicted through the VSEPR (Valence covering Electron Pair Repulsion) Theory, which various other molecules, prefer H2O, no have.

To discover out even if it is a given molecule is polar or non-polar, us must also understand the determinants which space responsible because that the polarity of a molecule. These factors are explained below in detail

Molecular structure & Geometry

The polarity the a molecule is an extremely much dependent on the structure and geometry. Together the bond angle in between the bonds identify if the resultant dipole minute of the as whole molecule is same to 0 (Zero) or not.

VSEPR (Valence covering Electron Pair Repulsion) theory helps to determine the geometrical form of the molecule which offers us the bond angle.

The Lewis framework of the molecule offers us an overview of every the lone pairs of electrons the are present in the molecule.

If this lone bag of electrons continue to be unbalanced i.e. Unsymmetrical climate the molecule acquires a polarity (like in NH3 wherein the Nitrogen atom has the lone pair).

The molecules which are highly symmetrical space Non-Polar (like BF3).

For an ext detailed information, friend must likewise check out the post written ~ above BF3 Lewis Structure, molecule Geometry, and also Hybridization.


Electronegativity is denoted by price χ (Greek letter Chi). It have the right to be identified as the capacity or the pressure with which an atom of an aspect pulls the shared electrons of a bond in the direction of itself make the sharing as unequal.

The higher the electronegativity of an atom, the more tendency it has actually to lure the mutual electron bag of a bond in the direction of itself.

It is made decision by two factors, firstly, the atomic variety of the atom and secondly, the street which is present in between the valence electrons of an atom and its positively charged nucleus.

A routine table the electronegativity of aspects has been given by Linus Pauling. According, to which Fluorine facet has the highest electronegativity equal to 3.98.

Bond Polarity

To recognize whether a compound is polar or non-polar, us must first have one idea about what do we mean by Polarity.

When atoms of different elements come together to kind a compound, they carry out so by occurring a bond in between them. In this bond sharing of electrons take place yet this share is constantly not equal between the elements.

The aspect with a higher electronegativity worth attracts the shared electrons in the direction of itself thus gaining a partial an adverse charge (δ-) and the element with less electronegativity value acquires a partial hopeful charge (δ+).

As a result, a separation of fee within the shortcut takes place and also bond polarity develops. For a bond to it is in polar, the electronegativity difference in between the two atoms should be higher than or equal to 0.5.

However, shortcut polarity alone does no make a molecule polar.

Dipole Moment

When a bond repurchase polarity i.e. Separation of charge occurs climate a bond dipole moment is developed. That is a measure up of the polarity of the bond make by 2 atoms.

Chemists represent the dipole minute with the slight variation in arrowhead symbol through the arrowhead pointing in the direction of the negative center, as depicted:

δ+ ———————> δ-

Since dipole minute is a vector amount i.e. It has both magnitude and direction, therefore, it can also be 0 (Zero) as soon as the two opposite bond dipoles cancel each other as result of the symmetry geometry of the molecule, choose in BF3.

It is measure up in Debye Unit, denoted by ‘D’. 1 D = 3.33564 × 10-30 C.m, whereby C is Coulomb and m stands for a meter. To calculation the dipole moment we must recognize the shape and also structure of the molecule. Mathematically, the dipole moment of a bond can be calculation by utilizing the formula provided below:

Dipole moment (µ) = fee (Q) * street of separation (r)

A molecule may have actually all its bond polar and also yet it can be non-polar (like BF3), that happens because of the canceling of dipole moments of all the binding making the result dipole minute equal come 0 (Zero).

Now, v the ideas clear in our minds we can clearly understand just how the BF3 molecule is non-polar despite the presence of F (Fluorine), a very electronegative element

Properties that BF3

Boron Trifluoride is toxicity when existing in its gaseous state however dissolves easily in cold water due to its high solubility and also gives Hydrofluoric mountain which is extremely corrosive in the nature.

It have the right to corrode metals consisting of stainless steel. Its solubility in cold H2O is 106%.Vapors that BF3 room heavier 보다 air and the an extensive exposure of BF3 containers to heat or fire may have actually a rupturing or rocketing effect.

Even though it is colorless however forms thick white fumes in moist air due to the visibility of H2O molecules, however, it is stable in a dry atmosphere.

BF3 is also dangerous upon heating for decomposition as it produce toxic and corrosive fumes that Hydrogen Fluoride.

BF3 (Boron Trifluoride) can also be provided to polymerize unsaturated compounds.

Uses that BF3 (Boron Trifluoride)

BF3 (Boron Trifluoride) has plenty of uses in miscellaneous industries.

It is provided as adhesives and also sealant chemicals, adsorbents and also absorbents, fuels and also fuel additives, oxidizing/reducing agents, binding certified dealer for commercial manufacturing, plastic industry, drug production, etc. (Source:

The document manufacturing industry likewise uses BF3 (Boron Trifluoride) because that the production of pulp.It is also used as a lubricant because that engines, brake fuels, oils, etc. Except this, it is helpful in manufacturing oils, crude oil oil, crude oil petroleum, sleek oil products, fuel oils, drilling oils, etc.

The most essential use the BF3 (Boron Trifluoride) wake up to be in necessary synthesis as a catalyst for numerous reactions the are beneficial in industrial productions. Some of them are discussed below:

Friedel-Crafts alkylation reactionsCleavage the ethers to alcoholsEsterification reactionsNitration and also Sulfonation of aromatic compounds (Source: Brotherton RJ et al; Ullmann’s Encyclopedia of commercial Chemistry 7th ed. (1999-2012))

By now, you must have plainly understood the principle behind the polarity and also non-polarity of a molecule including the factors which are particular to BF3 (Boron Trifluoride) to make it non-polar.

See more: What Element Has 18 Protons And 20 Neutrons ? Elements Flashcards

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