11 Facts on KrF2 Lewis Structure & Characteristics

KrF2 Lewis structure refers to the electronic sketch of KrF2 where the electrons are denoted by dots. It would be helpful for differentiating various chemical facts about KrF2.

KrF2 is a stable compound that is clearly made of a noble gas that is Krypton, which is highly stable, and an idol for the elements of its same period in periodic table. The smallest element in the table that is Fluorine contributes stability too in the compound by making strong binds with Krypton.

The factors that influence the importance Lewis structure of the compound could be represented in this article with exhaustive notes. Let us discuss the various features of KrF2 below:

How to draw KrF2 Lewis structure?

Few simple and basic steps are generally followed to draw fundamental Lewis dot structure of any compound. The steps are described below:

Step 1: Valence electron calculation

Calculation of valence electrons in each of the elements participate in the formation of the compounds must be prioritised fundamental step for initiating the drawing of Lewis structure.

Number of valence electrons present in Krypton and Fluorine must be counted before starting the drawing. let us calculate the total number of valence electron in KrF2 below:

  • Number of valence electrons in one Krypton = 8
  • Number of valence electrons in each of the Fluorine atoms = 7
  • Number of valence electrons in two Fluorine atoms = (7*2) = 14
  • Hence, total number of valence electrons in KrF2 is [8+14] = 22.

Step 2: identification of central atom

Krypton is the chosen one for holding central position in the compound. As it is a single Krypton participates in the formation of KrF2 which s clear from the chemical formula of the compound.

Element with higher electronegativity holds the central position is a Lewis structure. Though Kr is less electronegative than Fluorine it is chosen as central atom. As one Kr and Two similar F atoms make KrF2, Kr is found to be suitable for being in middle of the compound.

Step 3: Bond formation  

Here the bonds are arranged with lines by identifying the number of bond pairs created by the elements. One electron from each of the Fluorine and one electron of Krypton connects with each others and makes the bonds.

krf2 lewis structure
KrF2 Lewis structure and bond formation

In Krypton there are two simple Sigma bond are present that join the participant electrons.

Step 4: Formal charge calculation

Following this step the individual charge of the Krypton and two Fluorine atoms should be calculated. This Individual charges push us to identify total formal charge pf the compound. This step significant broadens the study with internal information.

Step 5: Presence of lone pairs identification

Both of Krypton and fluorine atoms hold three lone pairs. The step must be followed before representing the final sketch of the compound.

These steps help to make the Lewis structure proper with few significant importance of the compound. These step regulate the formation in a systematic that makes the structure informative. Information such as valence electrons, type and strength of bonding can be recognised from the Lewis structure.

KrF2 Lewis structure resonance

Resonance refers to the mechanism that represents the alternative structure of the compound with the similar chemical formula. We can prominently discuss the matter below:

KrF2 Lewis structure has no Pi bonds or negative charge. The compound does not hold any extra single electrons in its electronic structure as well. Therefore, there is no chance of resonance. Presence of pi bonds in structure gives alternative resonating structures which are irrelevant for KrF2.

KrF2 Lewis structure shape

Shape of the compound depends on several features. An electronic structure of compound possesses lone pairs and its’ shape differs. Let us discuss the shape below:

The KrF2 Lewis structure is shaped as linear. The geometry of this compound is Trigonal bipyramidal as it has three lone pairs in its central atom. Geometry and shape are taken as same features in the compounds but is important to differentiate these factors in case of identifying the effect of lone pairs.

According to VSEPR theory, lone pair-lone pair and Lone pair-bond pair repulsion are the reason behind arousing different shapes to the compounds. The KrF2 Lewis structure do not feel this kind of repulsions.

KrF2 Lewis structure formal charge

Formal charge is the feature that technically supports the chemical balance in any compound. let us reveal the fact by calculating the formal charges of individuals in the compound.

  • There is a specific formula for calculating the formal charge of compounds.
  • The formula of Formal Charge = [number of valence electrons on atom] – [non-bonded electrons + number of bonds.
  • Formal charge of Krypton:  [8 – 6+2] = 0.
  • Formal charge of two Fluorine atom: [7 – 1+1] = +5

Net charge is Zero in Krypton difluoride as its central to is beholding zero net charge. Most of the time, the properties of central atoms influence the overall properties of a compound. This is highly immense in giving potential chemical value to a compound.  

KrF2 Lewis structure angle

Lewis structure is relevant in delivering facts about angle of a compound. Let us describe that angle which is formed by the elements after making Sigma bonds with each other.

Krypton difluoride lies under 180-degree bond angle. It possesses a geometry where the elements are on a straight line but the lone pairs create 45-degree angles in between them. It can be found hat defining the angle is easier for Lewis structure of Krypton difluoride.

KrF2 Lewis structure octet rule

Defining octet rule is highly productive for any compound that helps in identifying the chemical reason behind sharing of transferring electron. Let us identify the reasons below:

KrF2 Lewis structure octet rule says, Krypton has already eight electrons in its last energy level. It is one of the most stable noble gases in periodic table. A fluorine atom contains seven electrons, these atoms need one more electron to gain that ultimate stability with filled octet state.

Octet rules defines that fulfilling octet state is must needed for any element to be as stable as noble elements. Each element has to follow up the octet state like their respective noble elements. and Octet rule proves it is significant to give up or gain extra electrons for achieving ultimate stability.

KrF2 Lewis structure lone pairs

Presence of lone pairs is the feature of any compound. Let us define different characteristics of the compound such as bond angles, polarity, non-polarity, hybridisation and others. 

KrF2 Lewis structure has three lone pairs in its geometry. It can be said that these lone pairs can impose some potential effect on the bond angle of the compound. According to VSEPR theory, bond angle might be changed with the influence of lone pair-lone pair and lone pair-bond pair repulsions in KrF2.

There is no lone pair-bond pair repulsion takes place in Krypton difluoride as it is a simple compound with two sigma bonds in one straight line. It changes the geometry in Trigonal bypyramidal structure. VSEPR (Valence Shell Electron Pair repulsion) theory has found that the lone pairs provide huge tension on the bonds angles by making repulsions.

KrF2 hybridization

Hybridisation embraces the internal information with chemical representation of presence of electrons. Let us discuss KrF2 Hybridisation in brief below.

The hybridised representation of Krypton difluoride is Sp3d. This hybridisation structure is the mixed version of hybridisation of single Krypton and fluorine atoms. After creating bond, Krypton gets electrons in its d orbital and proposes a combines hybridisation of sp3d manner.

The hybridisation structure of central atom in KrF2 is sp3 that influences the refereed hybridisation of mixed shell. Besides, it can be found that electron arrangement in fluorine atoms highlights sp3 hybridisation.  

Why KrF2 is sp3d Hybridised?

Let us find the reason behind considering the hybridisation format of Krypton difluoride as sp3d.

Both of Krypton and its ligands, Fluorine atoms have sp3 hybridisation. Therefore, it is significant that after sharing electrons they have a change in their valence electron shells. electrons changes their position is the both the elements and forms a new hybridised state in the newly formed compound.

Over looping among the electrons and valence shells is the key reason that emerges new hybridised state of compounds. In KrF2 new pair of electrons forms in the d orbital of fluorine atoms which is the reason behind extension in the hybridisation from sp3 to sp3d.

How KrF2 is sp3d Hybridised?

The process of making sp3d hybridisation from sp3 structure by both Krypton and Fluorine are being described below.

KrF2 has set up sp3d hybridisation by setting a combination of hybridisations. This information have been collected by studying the over looped structure of valences shell of Krypton and Fluorine.

After creating bond, Krypton gets electrons in its d orbital and proposes a combines hybridisation of sp3d manner. This hybridisation forms by sharing or transferring electrons with each other. 

Is KrF2 polar or non-polar?

Polarity is also effected by presence of lone pairs and electronegativity of the elements. Let find the polarity of KrF2 with a descriptive study on the matter below.

Krypton difluoride is a Non-polar compound. We define this non-polarity of Krypton difluoride through description of the lone pairs in each of the elements. Besides, Fluorine can be referred as the most electronegative element in periodic table that means Krypton is less electronegative than Fluorine.

KrF2 as Non-polar compound

Why is KrF2 Non-Polar?

The reason of being non-polar for Krypton difluoride is quite interesting. Let us make a brief description on that factor below.

KrF2 is non-polar as Kr feels huge tension from both of the sides. There the most electronegative Fluorine atoms are present. Both of the atoms have three lone pairs. Therefore, tension from each sides is same and its cancelled out the effect on centre atom. This is the main reason to call KrF2 non-polar.

Electronegativity is the features of chemical elements which is found to be different for each atoms. His factor effect on the polar and non-polar nature of the compound that is found to be a valuable physical property of compounds.

How is KrF2 is non-polar?

The process of making non-polar structure by Krypton difluoride is illustrated below.

The amount of polar tension from left Fluorine atom is same as the tension of right Fluorine atom. The resultant tension becomes zero which caters no effect on the Krypton atom. Both of the Fluorine atoms creates similar attraction on the electrons of Kr. In this way polarity of KrF2 becomes zero.

Is KrF2 ionic or covalent?

Ionic and covalent characteristics of compounds can be identified to highlight the bonding structure. let us identify the reason of categorising KrF2 as Ionic or covalent.

KrF2 is a covalent compound. It is noticed to be formed by electron sharing method. Krypton shared two electrons partially from its valence shell to two Fluorine atoms. It helps those atoms to gain stability for existing in periodic table.

Ionic nature of compound is displayed by transferring electrons from one element to another one. Creating bond by sharing electrons informs about the covalent characteristics of compounds.

Why KrF2 is Covalent?

The key reason of recognising Krypton difluoride as Covalent is being discussed below.

KrF2 is Covalent due to its formation by electron sharing process. It does not undergo electron transferring method. Partial electron sharing process activated the both the atoms to generate two sigma bonds with each other and gives out a simple compound called Krypton difluoride.

How KrF2 is Covalent?

Let us develop a brief discussion on the process of forming Covalent structure by KrF2.

KrF2 represents covalency through Low melting and boiling point. Krypton shares its one electron with one Fluorine atom and other electron with another Fluorine. Each of the sides of Krypton gets one sigma bond which refers to covalent formation process.

Is KrF2 linear?

Linear compound can be described by 180-degree bond angle of compounds. A supportive description on the topic is given below by emerging exclusive study of KrF2.

KrF2 is great example of linear compounds. It has exactly 180-degree angle in between two sigma bonds. As the two ligands are same for the compound, both side effects are similar and it does not allow the compound to be deviated from the ideal bond angle.

Why KrF2 is Linear?

Let us define the reason of calling KrF2 a linear compound below.

KrF2 is Linear due to the simple bonding between the elements. Here the bonds between Krypton and two Fluorine atoms lay on a single straight line. this is the key reason for defining the compound as linear compound.

The compound that holds only two ligands and the ligands are attached in the opposite sides of central atom on a single straight line can be referred as linear compounds.

How does KrF2 create Linear shape?

Let us shortly examine the process of making linear shape by Krypton difluoride below.

A straight line is created by the elements of KrF2. They make this after bonding with each others. that line does not deviate from its ideal position as there is no external forces works on the bonds. This is how it processes a Linear and simple structure.

On KrF2 there are total 9 lone pairs exists but none of those pairs affect the bonds. Therefore, no tension on the bond angle is created through external forces (generally created by lone pairs and electronegativity). It can sustain the ideal linear format of structure.

Does KrF2 have a dipole moment?

Dipole moment is the property that can be controlled by the presence of lone pairs on the participative elements. Let’s make a brief description on the facts below.

Krypton difluoride has Zero Dipole moment as number of lone pairs in both the sides of Krypton. The lone pairs are held by Fluorine is same. Both fluorine atoms have three lone pairs and the lone pairs have a huge gap between them, which does not allow any lone-pair-lone pair repulsion in the compound.

Why and how does KrF2 has zero Dipole moment?

Let us recognise the effective reason that supports the fact of having zero dipole moment by KrF2 below.

KrF2 has zero dipole moment due to zero resultant of polar movements in the compound. the dipole moment created by left Fluorine atoms is cancelled out by the dipole moment created by right Fluorine atom.

Lone pair-lone pair and lone pair-bond pair repulsions are the reason that increases amount of dipole moment. Dipole moments can also depend on the presence of pi bonds in the compounds. These reasons are ineffective in the case of KrF2.


This article has delivered the information about Krypton difluoride, where the information included the process of formatting Lewis structure of elements, which contains five relevant steps of drawing. KrF2 has supported besides, linear shape with 180-degree angle of the compound with the information of having non-resonating structure. 

Sarnali Mukherjee

Hi.....I am Sarnali Mukherjee, a graduate from the University of Calcutta. I love to teach and share knowledge on chemistry. I have gradually gained interest in article writing since one year ago. I would love to acquire more knowledge on my subject in the future. Let's connect through LinkedIn: https://www.linkedin.com/in/sarnali-mukherjee-921b59231

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