It is one of the most typical gaseous molecules having actually a reddish-brown hue. It can be cooled and compressed into a yellowish-brown fluid for tendshipping and also transport.

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A extremely toxic poisonous chemistry compound, NO2 is a significant air pollutant and also belongs to the group of oxides of nitrogen.

This chemical can be used for bleaching and also sterilization purposes.

It has actually applications in tobacco and explosive industries. NO2 acts as an intermediary in HNO3 acid manufacturing and an oxidizer because that fuels in rockets and space probes.

Below room the laboratory preparation methods of Nitrogen Dioxide.


Lewis Structure

A brief Intro

Inside an atom, we have the positively fee nucleus surrounding by electrons in their shells forming a negatively charged cloud.

The electron in the outermost shell which determine the valency are known as valence electrons.

Lewis framework is a diagrammatic representation of any kind of given molecule v the aid of the constituent atoms and also the position and also arrangement of electron to type bonds and also lone pairs.

This is a restricted theory on chemistry bonding nature and also electronic structure yet provides a straightforward viewpoint in the direction of the development of any molecular composition.

Let us talk around drawing the Lewis structure for Nitrogen Dioxide ( NO2 ).

Lewis framework of NO2

A molecule that nitrogen dioxide is composed of one nitrogen atom and two atoms of oxygen.

Let us look in ~ the periodic table.


Nitrogen belong to group 15( or team 5) and also has an atomic number of 7, because of this has a valency of 5. Oxygen belong to group 16 ( or team 6) and also has an atomic number of 8, because of this a valency the 6.

Total valence electron number in NO2 = 5 + 6*2

= 17.

Now, to uncover out i m sorry atom will certainly act together a main one, we need to look at Pauling’s Electronegativity chart.

Nitrogen is the least electronegative element between the two, therefore N will be the main atom.

This is exactly how we have actually placed the nitrogen in the center surrounded by the two O atoms.


Now, v the aid of period structures, we will certainly surround the atom by their valence electrons.


We have followed the octet dominance here.

Octet Rule

Do you know that the aspects present in the main groups of the regular table have a propensity to kind an eight-electron arrangement in their valence shell adhering to noble gas configurations?

This is known as the octet rule and also is an essential concept to lay out the many probable Lewis structure of a molecule.

Look in ~ the diagram again. We have currently made the two O atoms accomplish the Neon configuration.

Now, the Nitrogen atom has only five electrons neighboring it and also the total variety of valence electrons has actually been provided up already.

For the Nitrogen atom to have a close to octet configuration, we space going to transition two electron from one O atom and form a double bond.

Here we go.


Nitrogen now has actually 7 electron and achieved a close to octet configuration.

Formal Charge

Let us inspect the formal charge.


Formal charge of O ( in a solitary bond with N )

= 6 – 0.5*2 – 6 = 6 – 1 – 6 = -1.

Formal charge of O ( in a double bond through N )

= 6 – 0.5*4 – 4 = 6 – 2 – 4 = 0.

The formal charge of main N atom

= 5 – 0.5*6 – 1 = 5 – 3 – 1 = 1.

If we now find the summation the the full formal dues we get a net an outcome of 0.

Hence, the molecule is neutral and the elements are current in their least possible formal fee values.

Therefore, the most perfect Lewis framework of NO2 is:


Molecular Geometry

Let us look at several of the limit of Lewis Structure:

It have the right to only administer a 2D representation and also not a 3D one.Lewis Structure deserve to only talk about the plan of electrons however not just how the electrons are shared.It have the right to only recognize the kind of bond formation however cannot elaborate on how the bond formation takes place.

This is whereby the function of VSEPR theory comes:

VSEPR theory

VSEPR stands for Valence covering Electron Pair Repulsion model.

According come this theory, due to the fact that electrons carry like charges ( ‘-’ ), they space bound to suffer repulsion and this strength of repulsion varies across bonded and also lone pair electrons.

So, this repulsion pressure needs come be reduced to type a steady or well balanced polyatomic molecule or ionic structure.

VSEPR hence helps in predicting the 3D molecular geometry or form of a molecule along with the link angles.

What is the molecule Geometry of NO2?

In the VSEPR model, we have actually the AXnEx notation.

A stands for the central atom, below we have actually nitrogen ( N ).

X stands for the neighboring atoms, below we have actually two O atoms.

n means the variety of atoms about the main element, we have the worth of 2.

E represents non-bonded electron ( typically a lone pair), x represents the number.

Here, since we have actually just one lone electron, Let us take it together 1.

We have an AX2E1 notation.

VSEPR chart:


We have the right to see the NO2 has actually a bent molecular geometry and the angle is roughly 120 degrees.

But right here we have actually some exceptions. In NO2, we have actually 2 link Pairs and 1 lone electron.

If we look at the nitrite ion NO2-, we have actually 2 shortcut Pairs and also 1 Lone pair of electrons.

There we additionally have a bent framework but since repulsion toughness is of the stimulate of LP-LP > LP-BP > BP-BP, the bond edge order is together below

NO2+ > NO2 > NO2-.

Therefore, the bond edge of NO2 is around 134 degrees. The bond size is roughly 1.20 Å.



Orbital Hybridization

Do you know that one electron have the right to be defined with the help of its tide function?

We are aware of the concept of atom orbitals, the mathematical probability features indicating the existence of electrons in any regional space.

When wave attributes of atom orbitals integrate or type a fusion, it outcomes in hybrid orbitals and also the process is recognized as orbital hybridization.

Hybridization the NO2

The single bond in N-O has one sigma bond and also the dual bond N=O has one sigma bond and one pi bond. Pi bond doesn’t take part in hybridization.

Now, in NO2 we have actually 17 valence electrons, because of this this is an odd-electron system. For solitary electron species, we have the following preeminence to follow:

If the oxidation state the the main atom is uncovered positive then the electron will get involved in the hybridization process but if the oxidation state is negative, it will not participate.

In nitrogen dioxide,

Steric No = 2 sigma + 1 lone electron.

The main N is much less electronegative 보다 O. Therefore, the fee on N is ‘+’.

So, the oxidation state is uncovered positive and also the lone electron will take part in hybridization.

steric no = 2 + 1 = 3. Therefore, the hybridization the NO2 is sp2.


NO2 Polarity

What is Polarity?

Polarity is an important concept the chemistry. Every molecule composition has a building of polarity i m sorry determines even if it is the claimed molecule is polar or non-polar. This relies on the nature of chemical bonding which impacts the shape and geometry.

A diatomic homogeneous molecule that consists of prefer atoms always results in zero dipole moment and also hence non-polar.

However, within a heterogenous polyatomic molecule, we have actually several atomic facets with different varying electronegativity values. This cause partial dues on atom which if no canceled out outcomes in polar molecules.

Also, the irregularity and also asymmetry the molecules v the help of lone pairs and bonds reason polarity as result of the uneven circulation of charges.

What provides NO2 a polar molecule?

Nitrogen has an electronegativity worth of 3.04 and oxygen has actually that of 3.44.

This way there is an electronegativity difference in between the two atomic elements. Back the difference is fairly less, we have actually an asymmetrical bent molecular structure that cause the net dipole moment and makes NO2 a polar molecule in reality.

For thorough information, friend should also once check out out an short article on the Polarity of NO2.

Molecular orbit (MO) Diagram


Electrons can have both particle and also wave-like nature. Molecular Orbital concept is a ide of quantum mechanics the attempts to describe the chemistry bonding inside any kind of molecule.

In this theory, we get to understand that valence electrons can be shared among all ingredient atoms and atomic orbitals from different atoms combine to form molecular orbitals ( MOs ).

Here, we will incorporate details terminologies like anti-bonding, non-bonding, and also bonding orbitals. Also, we have the concept of HOMO ( highest possible Occupied molecular Orbital) and LUMO ( lowest Unoccupied molecular Orbital).

MO Diagram for NO2

Let us look at the electronic configuration the both N & O.N: 1s2 2s2 2p3O: 1s2 2s2 2p4 ( we have actually two O atom in NO2 )

The 6 electrons present in the 1s orbital execute not take part in bonding, therefore will beat the duty of non-bonding orbitals.

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The 2 electrons the 1s2 in the Nitrogen atom take part in σ2s MO. The oxygen atoms add to 2 lone pairs each.

The continuing to be electrons in p orbitals the N and O kind the σ2px,