Beryllium fluoride is an not natural compound that shows up as colorless lumps have actually a chemical formula BeF2. It is an odorless white solid also known as fluoride salt of beryllium. That is generally used in biochemistry.

You are watching: What is the molecular geometry of bef2

In this tutorial, we will talk about Beryllium fluoride (BeF2) lewis dot structure, molecular geometry, electron geometry, hybridization, polar or nonpolar, its link angle, etc.

Beryllium fluoride has actually distinctive optical properties and also its structure resembles the of quartz. The is chemically stable and in the solid-state exist together a glass.

Properties the Beryllium fluoride

It has a molar mass of 47.01 g/mol.It shows up as colorless lumps.It has a boiling point of 1,169 °C and also a melting allude of 554 °C.It is denser 보다 water and highly soluble in one aqueous solution.It has a trigonal decision structure.
Name of MoleculeBeryllium fluoride
Chemical formulaBeF2
Molecular geometry that BeF2Linear
Electron geometry the BeF2Linear
NatureNonpolar molecule
Total Valence electron for BeF216

Page Contents show
1 exactly how to attract lewis framework of BeF2?
2 monitor some measures for drawing the lewis dot framework for BeF2
3 What room the electron and also molecular geometry that BeF2?
4 Hybridization that BeF2
5 The bond edge of BeF2
6 Beryllium fluoride polarity: is BeF2 polar or nonpolar?
8 an introduction

How to attract lewis structure of BeF2?

BeF2 Lewis structure has beryllium atom in main position conversely, both fluorine atom bordering to it. Over there is no lone pair current on the main atom yet 3 lone pairs existing on each external atom in the lewis dot structure of BeF2.

BeF2 Lewis structure is exceptional to the octet preeminence as its central atom doesn’t require 8 electron in the outermost shell to attains stability.

Let’s see how to attract this in a simple way.

Follow some steps for illustration the lewis dot structure for BeF2

1. Count full valence electron in BeF2

First that all, identify the valence electron that is obtainable for illustration the lewis structure of BeF2 because the lewis chart is all about the depiction of valence electron on atoms.

So, one easy method to find the valence electron of atoms in the BeF2 molecule is, just to look in ~ the periodic group of beryllium and also fluorine atoms.

As beryllium atom belongs to group 2nd in regular table and fluorine positioned in 17th group, hence, the valence electron for beryllium is 2 and for fluorine atom, that is 7.

⇒ Total variety of the valence electron in beryllium = 2

⇒ Total variety of the valence electrons in fluorine = 7

∴ Total variety of valence electron easily accessible for the BeF2 Lewis structure = 2 + 7(2) = 16 valence electrons  <∴BeF2 molecule has one beryllium and also two fluorine atom>


2. Find the least electronegative atom and placed it in ~ center

An atom through a less electronegative value is much more preferable because that the main position in the lewis diagram since they are much more prone come share the electron with neighboring atoms.

In the case of the BeF2 molecule, the beryllium atom is much less electronegative than the fluorine atom, also, fluorine is the highest electronegative facet in chemistry, hence, it always takes the surrounding position in the lewis diagram.

So, just put the beryllium in the center position and spread both fluorine atoms about it.


3. Connect outer atoms to main atom with a solitary bond

In this step, location the single bond in between the external atom(fluorine) and central atom(beryllium).


After connecting each external atom come the central atom, count the number of valence electrons provided in the over structure. There space 2 single used in the above structure, and one solitary bond method 2 electrons.

Hence, in the over structure, (2 × 2) = 4 valence electrons are provided from a complete of 16 valence electrons accessible for illustration the BeF2 Lewis structure.

∴ (16 – 4) = 12 valence electrons

So, we room left with 12 valence electrons more.

4. Ar remaining valence electrons starting from outer atom first

Let’s start putting the remaining valence electrons on external atoms very first (in the instance of BeF2, fluorine is the external atom) to finish the octet i.e. Every atom must contain 8 electrons to finish the octet, an exception may occur.


Lewis dot structure for BeF2

So, both fluorine atoms in the over structure completed your octet, because both that them have 8 electrons(6 stood for as dots and 2 electron in a single bond) in their outermost shell. Also, the central atom(beryllium) also completed the octet due to the fact that it has 4 electrons(2 single bonds) in that outermost shell.

Beryllium atom only needs 4 valence electron in the outermost shell to complete the octet. (Exception to the octet rule).

Beryllium atom is exemption to octet preeminence just together H, He, Li, etc. That execute not call for 8 electrons to fulfill the octet. Their s-orbitals execute not require 8 electrons to finish the covering to feeling full, so they don’t follow the octet rule.

Now again count the variety of valence electrons supplied in the over structure.

There are 6 electrons placed over every fluorine atom, hence, (2 × 6) = 12 valence electrons, and we had 12 valences electrons remaining(check-in 3rd step).

∴ (12 – 12) = 0 valence electrons

So, we effectively used every the valence electrons obtainable that are available for illustration the lewis structure of BeF2.

Now we only have to verify the stability of the over BeF2 lewis framework with the help of the formal charge concept.

5. Check the stability with the assist of a formal fee concept

The lesser the formal charge on atoms, the far better is the stability of the lewis diagram.

To calculate the formal fee on an atom. Usage the formula offered below-

⇒ official charge = (valence electron – lone pair electron – 1/2 bonded pair electrons)

Let’s count the formal fee on the fluorine atom first, both fluorine atoms in the BeF2 Lewis structure(4th step) have actually the very same bonded pair and also lone pair, so, simply count the F.C. because that the one fluorine atom.

For fluorine atom:

⇒ Valence electron of fluorine = 7

⇒ Lone pair electrons on fluorine = 6

⇒ common pair electrons approximately fluorine(1 single bond) = 2

∴ (7 – 6 – 2/2) = 0 formal charge on both fluorine atoms.

 For beryllium atom

⇒ Valence electrons of beryllium = 2

⇒ Lone pair electron on beryllium = 0

⇒ mutual pair electrons roughly beryllium (2 solitary bonds) = 4

∴ (2 – 0 – 4/2) = 0 formal fee on the beryllium main atom.


So, every the atom in the BeF2 Lewis structure have a formal charge equal come zero. Therefore, the over lewis framework of beryllium fluoride is most appropriate and also stable.


BeF2 molecule geometry

 For maintaining the repulsive force least created by the electron pairs about the central atom, BeF2 repurchase the linear molecular shape.

The electron geometry the BeF2 is likewise linear because there is no lone pair existing on the central atom that can reason disorientation in the molecule.

Let’s find the molecular shape and electron geometry that BeF2 making use of the AXN method.


AXN notation because that BeF2 molecule:

A denotes the main atom, so, in the BeF2 molecule, beryllium is the main atom. A = BerylliumX denotes the bonded atoms to the central atom, as we know, beryllium is bonded through two fluorine atoms. Therefore, X = 2N denotes the lone pair on the central atom, as per BeF2 lewis structure, beryllium does no have any kind of lone pair. Hence, N = 0

So, the AXN share formula because that the BeF2 molecule becomes AX2N0 or AX2.

As per the VSEPR chart, if a molecule main atom is attached with two bonded atoms and has zero lone pair climate the molecular and electron geometry of that molecule will certainly be direct in nature.



Hence, the molecule geometry because that BeF2 is linear and its electron geometry is likewise linear.

Hybridization the BeF2

Let’s uncover the hybridizationn of BeF2 v the steric variety of its main atom.

“Steric number is the enhancement of a total number of bonded atoms roughly a central atom and the lone pair present on it.”

∴ Steric variety of BeF2 = (Number that bonded atom attached come beryllium + Lone pair ~ above beryllium)

As every the lewis structure of BeF2, the Beryllium atom is bonded through two fluorine atoms and also it consists of no lone pair of electrons.

∴ Steric number of BeF2 = (2 + 0) = 2

Steric numberHybridization

So, for a steric number of two, we obtain the Sp hybridization top top the beryllium atom in the BeF2 molecule.

The bond edge of BeF2

The bond edge of BeF2 is 180º together expected due to the fact that the beryllium central atom attains Sp hybridized and no lone pair existing on it. Therefore, no disorientation occurs approximately the main atom which provides it’s straight in form that has a bond angle of 180º.



Why is the electron and molecule geometry of BeF2 is same?

As we know, the molecule geometry the BeF2 is linear and also electron geometry is additionally linear because electron geometry predicts the shape of a molecule v the assist of lone pair too bond pair however molecular geometry has only taken bond pair to predict the form of the molecule.

As over there is no lone pair existing on the main atom in the BeF2 Lewis structure. Therefore, both molecular and also electrons geometry guess the shape of BeF2 through the help of external inspection pair the electrons.

Hence, the electron geometry and molecular geometry of BeF2 space the same(linear).

Why walk BeF2 lewis’s structure violate the octet rule?

Generally, the octet dominance said one atom is many stable when it has actually 8 electrons around it, an ext than this one atom is called a member of the hypervalent link or recognized as expanded octet.

So, in the situation of the BeF2 Lewis period structure, the beryllium central atom only gets 4 electrons in its external shell to attains stability and violate the octet.

This is because the beryllium atom has actually too few electrons to type an octet since it has only two valence electrons, therefore, it have the right to only form a maximum of two bond pairs(4 electrons in the outer shell).

See more: Used 2005 Chevy Malibu Gas Tank Size, Chevrolet Malibu Gas Tank Size


The complete valence electron is accessible for drawing the BeF2 Lewis structure is 16.The steric number of beryllium central atom in the BeF2 molecule is 2, thus, it develops Sp hybridization.BeF2 is a nonpolar molecule due to the fact that of symmetrical geometry that reasons the uniform circulation of fee in the molecule that leads come its net dipole minute zero.In the BeF2 Lewis period structure, a total of 6 lone pairs and also 2 bonded pairs space present.The molecular geometry that BeF2 is linear and also its electron geometry is additionally linear in nature.