BF3, likewise known together Boron Trifluoride, is an not natural chemical link which is a colorless gas through a pungent smell.

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Students often get confused concerning the polarity or non-polarity that BF3 (Boron Trifluoride) because of the visibility of 3 Fluorine atom which have actually a an extremely high electronegativity value when contrasted to the Boron atom.

So, is BF3 polar or non-polar? BF3 (Boron Trifluoride) is Non-Polar since of its very symmetric shape. It has a Trigonal Planar geometry i m sorry cancels out the dipole moment of the 3 BF bonds making the result Dipole minute of the compound equal to 0 (Zero).

Let’s shot to understand this in part detail. Come answer our question, we will analyze miscellaneous factors, responsible because that polarity, through respect come BF3.

Molecular framework of BF3 (Boron Trifluoride)

The BF3 (Boron Trifluoride) molecule has 1 atom the B (Boron, atom no: 5) and also 3 atoms of F (Fluorine, atomic no: 9). The valency the B (Boron) is 3 and also of F (Fluorine) is 7, therefore the Lewis structure of BF3 can be drawn as presented in the figure:


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

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


Electronegativity & link Polarity of BF3 (Boron Trifluoride)

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

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

To recognize if a shortcut is polar or no we must discover out the difference in between the electronegativity worths of the 2 atoms sharing a bond.

The difference in between the electronegativity worths of B and also F is same to 1.94 (3.98 – 2.04 = 1.94) i beg your pardon is better than 0.5.

Thus, each B-F bond in BF3 (Boron Trifluoride) molecule is polar. It means that the electrons are not shared equally through the two atoms (B and F) instead they space pulled towards F (Fluorine).

However, we should keep in mind that bond polarity is various from as whole molecule polarity. The shortcut polarity no always an outcome in all at once molecular polarity.

Dipole moment of BF3 (Boron Trifluoride)

The 3 bonds the B-F in BF3 (Boron Trifluoride) room polar (as questioned above) and thus they have actually a bond dipole moment as shown below:


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

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

Now, we know that the Non-Polarity of BF3 (Boron Trifluoride) is because of its highly symmetrical Trigonal Planar geometry, together predicted by the VSEPR (Valence shell Electron Pair Repulsion) Theory, which other molecules, choose H2O, no have.

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

Molecular structure & Geometry

The polarity of a molecule is an extremely much dependence on that structure and geometry. Together the bond angle between the bonds determines if the result dipole moment of the overall molecule is same to 0 (Zero) or not.

VSEPR (Valence shell Electron Pair Repulsion) concept helps to identify the geometrical form of the molecule which offers us the link angle.

The Lewis framework of the molecule gives us review of every the lone pairs of electrons that are existing in the molecule.

If these lone bag of electrons remain unbalanced i.e. Unsymmetrical climate the molecule repurchase a polarity (like in NH3 wherein the Nitrogen atom has actually the lone pair).

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

For more detailed information, you must additionally check the end the write-up written ~ above BF3 Lewis Structure, molecule Geometry, and also Hybridization.


Electronegativity is denoted by symbol χ (Greek letter Chi). It have the right to be characterized as the ability or the pressure with which an atom of an facet pulls the common electrons that a bond towards itself do the sharing as unequal.

The higher the electronegativity of an atom, the an ext tendency it has to lure the shared electron pairs of a bond towards itself.

It is chose by 2 factors, firstly, the atomic variety of the atom and secondly, the distance which is present in between the valence electrons of one atom and its positively charged nucleus.

A regular table the electronegativity of aspects has been provided by Linus Pauling. According, to which Fluorine aspect has the highest electronegativity equal to 3.98.

Bond Polarity

To know whether a compound is polar or non-polar, we must an initial have one idea about what perform we mean by Polarity.

When atom of different facets come with each other to kind a compound, they perform so by developing a bond between them. In this bond sharing of electrons take it place yet this share is always not equal in between the elements.

The facet with a greater electronegativity value attracts the common electrons towards itself thus getting a partial an adverse charge (δ-) and the aspect with less electronegativity worth acquires a partial hopeful charge (δ+).

As a result, a separation of charge within the link takes place and also bond polarity develops. For a link to be polar, the electronegativity difference between the two atoms have to be better than or same to 0.5.

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

Dipole Moment

When a bond acquires polarity i.e. Separation of charge occurs climate a bond dipole minute is developed. The is a measure of the polarity that the bond do by 2 atoms.

Chemists stand for the dipole minute with the slim variation in arrowhead symbol v the arrowhead pointing towards the negative center, together depicted:

δ+ ———————> δ-

Since dipole moment is a vector quantity i.e. It has both magnitude and also direction, therefore, it can also be 0 (Zero) as soon as the two opposite shortcut dipoles cancel every other because of the symmetrical geometry of the molecule, prefer in BF3.

It is measured in Debye Unit, denoted by ‘D’. 1 D = 3.33564 × 10-30 C.m, where C is Coulomb and m represents a meter. To calculate the dipole moment we must recognize the shape and also structure of the molecule. Mathematically, the dipole minute of a bond have the right to be calculation by using the formula given below:

Dipole moment (µ) = charge (Q) * distance of separation (r)

A molecule may have actually all its binding polar and also yet it can be non-polar (like BF3), it happens due to the canceling the dipole moments of every the bonds making the result dipole moment equal to 0 (Zero).

Now, v the concepts clear in our minds we can plainly understand exactly how the BF3 molecule is non-polar despite the presence of F (Fluorine), a extremely electronegative element

Properties that BF3

Boron Trifluoride is toxicity when present in its gas state however dissolves easily in cold water because of its high solubility and also gives Hydrofluoric mountain which is highly corrosive in its nature.

It have the right to corrode metals including stainless steel. That solubility in cold H2O is 106%.Vapors of BF3 space heavier than air and the prolonged exposure that BF3 containers to heat or fire may have a rupturing or rocketing effect.

Even despite it is colorless but forms dense white fumes in moist air as result of the existence of H2O molecules, however, the is stable in a dry atmosphere.

BF3 is additionally dangerous upon heater for decomposition as it produces toxic and corrosive fumes the Hydrogen Fluoride.

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

Uses of BF3 (Boron Trifluoride)

BF3 (Boron Trifluoride) has countless uses in various industries.

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

The record manufacturing industry additionally uses BF3 (Boron Trifluoride) for the production of pulp.It is additionally used as a lubricant for engines, brake fuels, oils, etc. Apart from this, that is helpful in production oils, crude oil oil, crude oil petroleum, refined oil products, fuel oils, drilling oils, etc.

The most vital use that BF3 (Boron Trifluoride) happens to be in necessary synthesis as a catalyst for numerous reactions that are valuable in industrial productions. Several of them are discussed below:

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

By now, you should have clearly understood the principle behind the polarity and non-polarity of a molecule consisting of the reasons which are details to BF3 (Boron Trifluoride) to do it non-polar.

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