N2O3 Lewis Structure & Characteristics (13 Helpful Facts)

N2O3 Lewis structure is a capable factor for indulging several significant facts about Dinitrogen trioxide. Let us signify the definition of N2O3 Lewis structure below:

N2O3 Lewis structure can be defined by representing the electronic structure of N2O3. It informs about the electronic reaction between Nitrogen and Oxygen atoms. Scientist Lewis first introduced such kind of structural format of compounds by using dots to display electron in the structure.

N2O3 Lewis structure can inform us about the shape and bond angle of the compound and other internal facts such as formal charge, hybridisation and maintenance of octet rule by individual atoms. Let us discuss those facts and characteristics throughout this article.

How to draw N2O3 Lewis structure?

Six fundamental easy steps follow drawing Lewis structure of compounds. Let us describe each step briefly to make the facts of N2O3 Lewis structure well understood.

Step 1: Calculation of valence electron

Calculating the number of valence electron in individual atoms is the first step of identify the total number of valence electron participate in bonding. In N2O3 both N and O atoms participate in bonding by sharing a specific number of valence electrons. Therefore, it is important to count that.

Step 2: Identification of electron requirement in atoms

After counting the number of valence electron, the shortage of electrons in each atom can be identified in the step. Both N and O atoms have urge to complete octet by filling valence shell with eight electrons. It has been found that in N atom there is shortage of 3 electrons and in O atoms it is 2.

Step 3: Verification of central atom

Least electronegative atoms reliably grab the centre in the chemical formation of the compound. Among N and O atoms N is less electronegative than O. Though N atoms take the central position, in the other alternative structure O atom gets the central position to make most stable bond by satisfying octet.  

Step4: Representation of bonds

Bond representation is the next step that is done through the implementation of electron dots among between N and O atoms. This is the unique characteristics followed only to outline Lewis structure. To show 1 bond, 2 electron dots and to display double bond, 4 electrons dots are put between N and O atoms.

Step 5: Lone pair’s identification after bonding

The figure of the compound is completed by putting lone pairs remained after making bond among N and O atoms in N2O3.  According to VSEPR (Valence Shell Electron Pair Repulsion) Theory, lone pairs internally affect bind angle and shape of compounds. So finding their existence is also significant.

N2O3 Lewis structure

Step 6: Formal charge calculation

Formal charge calculation is the last step for presenting the Lewis structure of N2O3. As the compound holds a specific charge density, it is needed to impose the facts for possessing those charges inside the compound and the way those are cancelled out to make neutral N2O3.

N2O3 Lewis structure shape

Shape of the compound is a physical property, which identifies the rigid molecular representation of the compound. Let us discuss about the shape of N2O3.

N2O3 Lewis structure is noticed to have planar molecular shape. This shape indicates that all the molecular components of this compound exist in the same plane. According to the planar shape of Dinitrogen trioxide, the molecule has Cs symmetry, which is a symbol of its uniqueness.  

N2O3 Lewis structure formal charge

Formal charge is very important to identify for the compound, as its internal charge density is quite interesting. Let us describe the fact for N2O3.

The formal charge of N2O3 is 0. It would be broadly counted by using the common formula for O=N-O-N=O structure (the alternative structure): Formal Charge = number of valence electrons – number of nonbonding electrons – number of electron shared (number of bonding electrons/2)

The calculation is outlined below:

Elements and the number of their valence electronsNumber of nonbonding electronsNumber of electron sharedFormal charge
N1 = 543(5-3-2) = 0
N2 = 523(5-3-2) = 0
O1 = 642(6-4-2) = 0
O2 = 622(6-4-2) = 0
O3 = 642(6-4-2) = 0
N2O4 = 280
Formal charge calculation of N2O3 Lewis structure

N2O3 Lewis structure angle

Angle between the different bonds in N2O3 has different value that identifies the stability of the structure. Let us identify the bond angle of the compound below.

N2O3 bond angles are in the range of 105o-128o.  Difference in bond angles in the structure of O-N-N-NO2 takes place due to different bond length. The first O-N bond has 105.1o angle, the second one has 112.7 o and third one has 117.5 o of angle. The NO2 group in it holds 129.8 o of angle between O-N-O.

N2O3 Lewis structure octet rule

Octet rule emphasises the fact of element for having 8 electrons in the valence shell to get stability like noble gases. Let us identify how N2O3 is made by following this rule.

N2O3 follows by making 8 electrons in the last electronic shell of each of the elements. In O=N-NO2 N1 atom shares two electrons with one O and another N atoms. N2 atom shares 3 electrons with 2 O atoms and N1 atom.  N2 atom holds a positive charge by leaving its extra e.

One O atom of NO2 group in the compound holds a negative charge. In O=N-O-N=O structure of N2O3 impose that each of the O atom fills its octet by sharing 2 electrons with N atoms and each of the N atom shares total 3 electrons with O atoms. It happens as O atoms need 2 e and N atoms need 3 e- to fill octet.

N2O3 Lewis structure lone pairs

Lone pairs in the Lewis structure are noticed to be the remaining electrons in valence shell after the elements make bonds. Let us count the number of lone pairs in N2O3.

N2O3 Lewis structure has total 8 lone pairs in the most considerable O=N-NO2 structure. O1 atom holds 2 lone pairs and N1 atoms holds one lone pair. In NO2 group, one O atom holds 3 lone pair and another one holds 2, here N atom holds zero lone pair.

In O=N-O-N=O structure each n atom holds one lone pair and each O atoms hold 2 lone pairs after making all N-O bonds. In this structure, the total number of lone pair is also 8.

N2O3 valence electrons

Valence electrons bring forth fundamental idea about the requirement of electron in the valence shells to satisfy octet. Let us count the total number of valence electron in N2O3.

N2O3 has total 28 valence electrons.

  • The number of valence electron in each N atom is 5
  • The number of valence electron in 2 N atom is (5*2) = 10
  • The number of valence electron in each O atom is 6
  • The number of valence electron in 3 O atom is (6*3) = 18
  • The total number of valence in N2O3 is (10+18) = 28

N2O3 hybridization

Hybridisation is the state, which signifies the electronic reaction between the elements. Let us identify the hybridisation state of N and O atoms in N2O3.

In N2O3, Central O atom is sp3-hybridised, N atoms are sp2-hybridised in O=N-O-N=O structure. In O=N-NO2 structure the central n atom has sp3 hybridisation as per its steric number (Addition of number of lone pair and bond pairs) which is 4.

N2O3 solubility

Solubility is the factor that identifies the internal strength of compound to be decomposed in presence of water or other compounds. Let us check solubility of N2O3 below.

N2O3 is soluble in various compounds, which are listed below:

  • Very much soluble in water (422g/mol)
  • Ether
  • Slightly soluble in HCl
  • Slightly soluble in H2SO4  

The solubility of the compound in water is more appreciable and in ether it has been identified o be diluted. This is due to the huge attraction of the compound towards polar solvents.

Is N2O3 solid or liquid?

Solid and liquid state is defined as the strength of bonds of the compounds. Let us identify in which state N2O3 is generally found in normal temperature.

N2O3 is noticed to appear as liquid compound with sharp odour. Therefore, it can be said that the internal force of attraction between the elements is low. This is due to the large bond length of N-O bonds. This factor makes the bonds easily breakable and the compound cannot keep compact internal structure.

Is N2O3 polar or nonpolar?

Polarity is the characteristics that occurs when the mirror image of both side of vertical axis of the compounds do not appear to be similar. Let us find this fact for N2O3.

N2O3 is a polar molecule. It means that the compound feels a specific amount of dipole moment at its terminals. Cs symmetry of the compound is the key factor that proofs its polarity. The amount of dipole moment in N2O3 is 2.122 D.

Is N2O3 acidic or basic?

Acidic or basic nature noticed to be the urge for electron among the compounds. Acidic compounds are more reliable to accept electron. Let us describe this fact for N2O3.

N2O3 is purely an acidic compound. It appears as acidic in nature as the electronegativity difference between N and O atoms is very low.it has been identified that the more electronegative the bonded atom with O atom the more acidic the compound appears to be.  Electronegative N makes the compound acidic.

Is N2O3 electrolyte?

Electrolyte compounds are defined by their ability of conducting electrons or electricity naturally or in molten state. This section will identify if N2O3 is electrolyte or not.

N2O3 can be considered as electrolyte. This compound is easily dissociable. After dissociation, the elements became able to conduct electricity with the help of their charges. Internal charge density of the Dinitrogen trioxide is also a factor that makes it considerable as electrolyte.

Is N2O3 ionic or covalent?

The process adopted by the element while bonding defines ionic and covalent structure of compounds. Let us recognise which process is adopted by N2O3.

N2O3 is purely covalent. Both N and O atoms shares their valence electron and makes N-O bonds. Cooperation between the valence electrons works behind the bonding as its reason. This factor develops the idea for N2O3 to satisfy its covalent appearance.


This article has identified that Cs planar shape of the Dinitrogen trioxide works behind its uniqueness in chemistry. N2O3 holds two different structure where in one N is considered as central atom in another O atom is considered to be place in centre position. Conclusively, the study about this compound identifies some exceptional characteristics in chemistry.

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