Phosphorus trifluoride (PF3) is colorless and also an odorless gas having comparable toxicity as that the carbon monoxide. It binds to the iron present in the blood hemoglobin to spread out throughout the body and prevents the blood from soaking up the oxygen.

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PF3 is a nucleophile wherein it donates a pair that electrons throughout a chemistry reaction.

Lewis chart is a photographic presentation of the variety of valence electrons existing in an atom, which readily reacts with the valence electrons of an additional atom to type a bond.

The diagram is attracted with the assist of eight dots about the atom, largely in pairs. Here, the number eight has actually been selected together per the octet rule.

Moreover, the line represents the formation of a bond in between the valence electrons of the two atoms. Counting these lines can aid with identify how numerous bonds have actually been formed within a molecule.

Octet Rule

As every this rule, the maximum number of valence electrons an atom deserve to have is eight. One phosphorus atom has five valence electrons, having a scarcity of 3 to finish its outermost shell or octet.

On the various other hand, a solitary fluorine atom has seven valence electrons through a d of one to complete its octet and reach a steady condition.

Valence electrons in Phosphorus and Fluorine atom

The electrons existing in the outermost shell of an atom are referred to as valence electrons. Since they are existing in the outermost shell, the organize of the cell core is weak ~ above them.

Moreover, uneven or unpaired electron compel lock to participate in the bond formation.

Here, it is crucial to know that a greater number that valence electrons will certainly strengthen the ability of an atom to expropriate the electrons rather than donating.

So, fluorine accepts the electron whereas, the phosphorus atom often tends to donate the electrons to complete their octet and reach a secure condition. The factor for the exact same is explained with the aid of their digital configuration.

The atomic variety of phosphorus is fifteen which renders its digital configuration 1s2 2s2 2p6 3s2 3p3. Together we know, the p shell have the right to hold a maximum of 6 electrons over there is a scarcity of three electrons.

Whereas, on the other hand, the atomic variety of fluorine is ripe which renders its digital configuration 1s2 2s2 2p5, having actually a scarcity of only one valence electron.

Lewis structure of Phosphorus Trifluoride (PF3)

The Lewis structure is attracted using eight dots that valence electrons roughly the icons of the atom through lines mirroring bond formation.

PF3 is a tetra-atomic molecule whereby phosphorus donates three valence electrons, and three fluorine atoms expropriate one electron each to experience a link formation and also reach a secure condition.

Below are the procedures to draw the lewis framework of the PF3 molecule 

1. Uncover out the total variety of valence electron in PF3, i m sorry is 26.

2. Uncover out the variety of valence electrons more needed the a single PF3 molecule to stabilize itself. The is six in total, where three valence electrons are required by the phosphorus atom and also one, every by 3 fluorine atoms.

3. Discover the total number of bonds forming in a solitary PF3 molecule. It is 3 covalent single bonds, each in between phosphorus and also fluorine atom with the visibility of no double or triple bonds.

4. Discover the central atom to draw the Lewis structure, i beg your pardon is phosphorus in the instance of phosphorus trifluoride (PF3).

5. Lastly, attract the lewis diagram as:


Geometrical structure of Phosphorus Trifluoride (PF3) molecule


The geometrical framework of the tetra-atomic Phosphorus Trifluoride (PF3) molecule is studied v the assist of the Valence covering Electron Pair Repulsion (VSEPR) theory.

This theory describes that the link angle in between the fluorine-phosphorus-fluorine (F-P-F) is 97°. This angle provides the structure bent whereby the best bond angle because that the bent, trigonal pyramidal framework is 109.5°.

This anomaly is as result of the lone pair the electrons, and also the smaller size of the fluorine atom. As the lone pair repulsion is more powerful than the shortcut pair or link pair-lone pair repulsion, the reduces the bond angle.

There exist a lone pair of electron on the phosphorus which walk not take part in the link formation. Since they are very stable, their repulsion is more powerful than that of the bonding pair that electrons.

When any shared pair of electrons come in the close to vicinity of lone pair the electrons, as carry out not desire to bond.

This repulsion distorts the entirety structure whereby the effect increases to plenty of folds due to the fact that of the smaller size of fluorine and much shorter atomic radius distance.

Due come its original pyramidal shape, the PF3 molecule transforms out to be polar. Girlfriend can likewise check an post related come the polarity of PF3.

Hybridization in Phosphorus Trifluoride (PF3) molecule

Hybridization is a method of combining atomic orbitals of the very same atom to produce brand-new orbitals i m sorry are called hybrid orbitals.

To figure out the hybridization that the central atom, the is important to identify the steric number in the phosphorus trifluoride (PF3) molecule.

The steric number is equal to the lone pairs and sigma bond the main atom has.

As a single phosphorus trifluoride (PF3) molecule has three binding (between phosphorus and also fluorine) and one lone pair of electrons, the steric number is four.

It means the molecule will develop four new hybrid orbitals that equal energy which synchronizes to sp3 hybridization.

As we know in a single covalent bond, the development of just sigma (σ) binding takes place with no pi (π) bonds. One sp3 hybrid orbit accommodates the lone pair the the electrons of the phosphorus.

Whereas, the other three sp3 hybrid orbitals formed from the covalent phosphorus-fluorine bonds, are offered to accommodate the 2p orbitals of the fluorine.

The newly created hybrid orbitals have 25% behavior of the s orbital and also 75% behavior of the p orbital.

For an ext detailed knowledge, girlfriend must additionally check the end the short article PF3 Lewis Structure and also Hybridization.

Molecular Orbitals diagram of Phosphorus Trifluoride (PF3) molecule

The molecular orbit diagram helps through determining just how chemical bond development is taking place. Also, it helps through figuring out just how mixing and overlapping have taken ar to produce four new hybrid orbitals.

The mixing and also overlapping happen in the orbitals of similar energy, conversely, the bonding electrons add to the formation of higher energy antibonding molecular orbitals.


Is over there back-bonding in phosphorus trifluoride (PF3) molecule?

Surprisingly, yes. Back bonding occurs between the atoms, where one has a lone pair of electrons while the other has a vacant orbital.

When lock reach surrounding to one another, a compound is developed which reflects pi-bonding attributes where developed from sigma bond.

If you realize, a single lone pair of electron in phosphorus is accessible to each one of the fluorine atoms. So, the phosphorus trifluoride (PF3) molecule undergoes back bonding.

Moreover, this further can be evidenced through the hybridization which says a solitary PF3 molecule shows 75% features of ns orbital.


The Lewis framework of the tetra-atomic phosphorus trifluoride (PF3) molecule reflects three fluorine atoms bonded to a solitary phosphorus main atom. Three solitary covalent bonds space formed in between the phosphorus and also fluorine atoms which contributes come the existence of three solid sigma bonds and also no pi bonds.

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Irrespective that it, the phosphorus trifluoride (PF3) shows pi bonding characteristics due to sp3 hybridization and also back-bonding. The information of how hybridization is following can it is in studied v the molecular orbital diagram that phosphorus trifluoride (PF3) molecule.