The lewis structure shows the prediction of valence electrons of molecules in the form of dots and lines. Let us discuss here, in brief, the KrBr4 lewis structure.
KrBr4 is the chemical formula of krypton tetrabromide. The lewis structure of KrBr4 is composed of two non-metallic elements i.e. one krypton atom which is a gas and four bromine atoms which are liquid substances. The Kr atom is a central atom due to its low electronegativity.
All the 1 Kr and 4 Br atoms are connected with each other by 4 sigma covalent bonds. It is and covalent compound and has 2 lone pairs on the central Kr atom. Let us discuss some more characterizations like the octet rule, valence electrons, lone pairs, and the shape of KrBr4 lewis structure with some more facts about it.
How to draw KrBr4 lewis structure?
To draw the lewis structure of KrBr4 one should have to follow the below – given steps.
Valence electrons and bonding in Kr and Br atoms.
Evaluate the total of the valence electrons in the KrBr4 lewis structure by adding all the valence electrons on each Kr and Br atom. Later make the bonding within the Kr and 4 Br atoms by making single sigma covalent bonds.
Lone pair electrons and application of octet rule on KrBr4.
The remaining valence electrons after bonding get placed first on all the outer 4 Br atoms and later on the central Kr atom. Then apply the octet rule on KrBr4 lewis structure to know whether all the Kr and Br have expanded, incomplete or complete octets.
Calculate Formal charge on KrBr4 lewis structure and its shape.
The formal charge that occurs on the KrBr4 is calculated by using a given specific formula. Finally determine the shape, bond angle, and hybridization of KrBr4 lewis structure.
KrBr4 valence electrons
The electrons get placed in the outermost valence shell orbital of atoms or elements and are called valence electrons. Take a look below explanation of the KrBr4 valence electrons.
KrBr4 contains a total of 36 valence electrons. The krypton atom belongs to the 18th periodic table group being a noble gas it contains 8 valence electrons in its outer shell orbital. The bromine atom belongs to the 17th group and has 7 valence electrons in its outer shell orbital.
The valence electrons calculation for the KrBr4 lewis structure is explained in the given steps below.
- Valence electrons on Krypton atom of KrBr4 is = 8 x 1 (Kr) = 8
- Valence electrons on Bromine atoms of KrBr4 is = 7 x 4 (Br) = 28
- The total of valence electrons present on KrBr4 lewis structure is = 8 + 28 = 36
- The overall electron pairs on KrBr4 lewis structure are evaluated by dividing the valence electrons of it by 2 = 36 / 2 = 18
- Hence, the KrBr4 lewis structure has a total of 36 valence electrons and 18 electron pairs.
KrBr4 lewis structure lone pairs
The remaining electrons in an atom or molecule which get unshared after bonding are called lone pair electrons. Below we are discussing lone pair electrons of the KrBr4 lewis structure.
KrBr4 lewis structure has 14 lone pair electrons on it. It contains 36 total valence electrons. From them, 8 valence electrons get engaged in bonding forms 4 covalent Kr – Br bonds. Leftover 28 unshared electrons get put on outer Br and central Kr atoms on pairing form 14 lone pairs.
The evaluation of KrBr4 lewis structure lone pair electrons is explained in the given below steps.
- Lone pair electrons on KrBr4 is = Valence electrons of KrBr4 (V. E) – Number of bonds / 2
- Lone pair electrons on the 1Kr atom of KrBr4 is = 8 (V. E) – 4 / 2 = 2
- Lone pair electrons on the 4 Br atoms of KrBr4 is = 7 (V.E) – 1 / 2 = 3
- Lone pair electrons on the KrBr4 lewis structure is = 2 (Kr) + 3 x 4 (Br) = 2 + 12 = 14
- Therefore, the total lone pair electron on the KrBr4 lewis structure is 14.
KrBr4 lewis structure octet rule
The occurrence of 8 electrons in an atom or element shows the stability it is explained in the octet rule. Let us see the application of the octet rule on the KrBr4 lewis structure.
The KrBr4 lewis structure shows an expanded octet of the central Kr atom and a complete octet of all 4 Br atoms. It has overall 36 valence electrons. The central Kr atom forms 4 Kr – Br covalent bonds with 4 Br atoms thus it has 8 bonding electrons. Also, it has 4 unshared electrons.
Thus the central Kr atom has a total of 12 electrons showing its expanded octet. The outer 4 Br atoms contain each 2 bonding electrons and 6 unshared electrons, Hence all the 4 Br atoms have 8 electrons around them having a complete octet.
KrBr4 lewis structure formal charge
The charge creates on atoms or molecules by donating or accepting the electrons is called a formal charge. Let us have a brief discussion on KrBr4 lewis structure formal charge.
The formal charge of KrBr4 is = (valence electrons – non-bonding electrons – ½ bonding electrons)
The calculation for the formal charge present on the KrBr4 lewis structure is given in the below table.
| Atoms of KrBr4 lewis structure | Valence electrons on Kr, and Br | Non – bonding electrons on Kr, and Br | Bonding electrons on Kr, and Br | The formal charge on Kr, and Br |
| Krypton (Kr) atom | 08 | 04 | 08 | ( 8 – 4 – 8 / 2 ) = – 2 |
| Bromine (Br) atoms | 07 | 06 | 02 | ( 7 – 6 – 2 / 2 ) = 0 |
KrBr4 lewis structure shape
The molecular arrangement of atoms having a definitely packed geometry is called a molecular shape. Let us discuss in detail the KrBr4 lewis structure shape and geometry.
The KrBr4 lewis structure has a square planar shape and octahedral geometry. The central Kr atom is linked with 4 Br atoms and has 2 lone pairs on it. In accordance with the VSEPR module and its theory of molecular orbitals, the KrBr4 shows AX4E2 generic formula.
Here, A is the central Kr atom attached with4 outer bonding Br atoms i.e. X4. Also, it has 2 lone pairs on it i.e. E2. Hence, it is forming the octahedral geometry and square planar shape of KrBr4.
KrBr4 hybridization
The orbitals of atoms get mixed and overlap or recast to form a new hybrid orbital with the same energy is called hybridization. Take a look at the details of the KrBr4 structure hybridization.
The KrBr4 compound shows sp3d2 hybridization in the central Kr atom. The krypton atom shows a steric number 6. The steric number of central Kr atom is evaluated as = Bonds formed by central Kr atom of KrBr4 + lone pair electrons on it. Therefore, Kr atom shows steric number is = 4 bonds + 2 lone pairs = 6.
As the KrBr4 has steric number 6, thus it shows sp3d2 hybridization according to VSEPR theory. Hence, in the KrBr4 lewis structure, it has the overlapping of one ‘s’, 3 ‘p’, and 2 ‘d’ orbitals of the central Kr atom and forms a novel hybrid ‘sp3d2’ orbital with equivalent energy.
KrBr4 lewis structure angle
The angle forming within the two immediate or alternate bonds in a molecule is called the bond angle of that molecule. Here we are discussing the bond angle of the KrBr4 lewis structure.
The KrBr4 lewis structure has a 90 – degree bond angle within the molecule. All the four Kr – Br bonds get to lie in the same plane forming a Br – Kr – Br bond angle of 90 degrees. Also, the two lone pair (L.P) electrons get to lie in the same plane and have an L.P – Kr – L.P bond angle of 90 degrees.
Properties of KrBr4
The properties of the KrBr4 compound are given in the following table.
| Properties | Values |
| Molecular weight | 403.42 |
| Density | 0.0004034 |
KrBr4 solubility
The solubility of any compound depends on its ability to dissolve at its maximum in the solvent solution is called solubility. Take a look at the discussion of KrBr4 solubility.
KrBr4 is soluble in water. As krypton is an inert gas element and dissolves in water. The Br atoms can also dissolve in water. The KrBr4 is a polar compound like water. Thus both polar – polar compounds get miscible with each other. It can form a complex compound with water.
Is KrBr4 solid or liquid?
The definite atomic arrangement with closed packing is solids and with loose packing are liquid compounds. Let us see whether the KrBr4 is a solid or liquid compound.
KrBr4 is a liquid compound. The Kr element is gaseous in nature while the Br is present in liquid form. KrBr4 is formed due to the insertion of gaseous Kr atoms into liquid Br molecules. Thus, it has loose packing of arrangement and Vander Waals forces between Kr and Br atoms forming a liquid KrBr4.
Is KrBr4 polar or nonpolar?
The unequal electron distribution and electronegativity difference of atoms determine the polarity of molecules. Below we are discussing whether KrBr4 is polar or non-polar.
KrBr4 is a polar compound. The central Kr atom and outer bromine atoms have nearly the same electronegativity but Kr is slightly more electronegative than Br. The Kr atom has an expanded octet with 12 electrons and it has 2 lone pairs. Hence it has not equal electron distribution within the molecule.
Thus, the partial negative charge creates on the central Kr atom and the partial positive charge creates on the outer 4 Br atoms. Also, the formal charge on Kr is -2 which confirms that KrBr4 is a polar molecule.
Is KrBr4 acid or base?
The proton donors can act as acid and proton acceptors can act as a base. Let us discuss a brief detail on whether KrBr4 is an acid or a base compound.
The KrBr4 is non – acidic or non – basic compound. Krypton is initially an inert element and has zero oxidation number. It can act as an oxidizing or reducing agent in reaction with other elements. It does not have any H+ ions to donate. The Kr and Br atoms have a +4 and -1 oxidation state.
Is KrBr4 electrolyte?
The moieties which can get dissolve and ionize in water and are able to conduct electricity are called electrolytes. Take a look at a brief detailed discussion on whether KrBr4 is an electrolyte or not.
KrBr4 is not an electrolyte. As it is soluble in water but cannot get ionized into water. It can form a complex compound with water. Thus, it cannot conduct electricity on the application of an external electric field on the KrBr4 + water solution. So, KrBr4 does not show the characteristics of being an electrolyte.
Is KrBr4 ionic or covalent?
The ionic compound forms due to the electrostatic force of attraction and covalent compounds can form due to sigma covalent bonds. Let us see whether KrBr4 is ionic or covalent.
KrBr4 is a covalent compound. All the Kr and 4 Br atoms get joined with each other by 4 single covalent bonds. Thus, it is hard to break these strong covalent bonds in KrBr4 and cannot form ions. So, the KrBr4 compound does not show any ionic character and hence is a covalent compound.
Conclusion:
The KrBr4 lewis structure has 36 valence electrons and 14 lone pair electrons. It has an expanded octet of the central Kr atom while a complete octet of all 4 Br atoms. It has a formal charge of -2 on Kr and zeroes on Br atoms. It has a square planar shape and octahedral geometry with sp3d2 hybridization and a 90-degree bond angle. It is a liquid polar water – soluble covalent compound.
Also Read:
- Io3 lewis structure
- Al3 lewis structure
- K2co3 lewis structure
- Ammonium lewis structure
- Ch3nh2 lewis structure
- Hgbr2 lewis structure
- Scn lewis structure
- No3 lewis structure
- Propanoic acid lewis structure
- Xeo3 lewis structure
Hello everyone, I am Dr. Shruti M Ramteke, I did my Ph.D. in chemistry. I am passionate about writing and like to share my knowledge with others . Feel free to contact me on linkedin