Hydrogen sulfide is a colorless gas with a molar fixed of 34.08 g·mol−1. That is poisonous and flammable v a smell choose rotten gas. That is additionally dangerous for the environment.

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In this article, us will discuss the adhering to things- Hydrogen sulfide (H2S) molecular geometry, lewis structure, electron geometry, its bond angle, polarity, hybridization, and dipole moment.

Hydrogen sulfide is created by anaerobic cradle in which microorganisms failure the organic matter in the absence of oxygen. It additionally occurs in volcano gases and in fine water also. It can also be obtained by that separation indigenous sour gas.

Hydrogen sulfide have the right to be produced by when ferrous sulfide treats with a strong acid favor HCl in typical lab preparation.

⇒ FeS + 2 HCl → FeCl2 + H2S

Most metals and non-metals sulfides after exposure come water lock liberate Hydrogen sulfide.

⇒ 6 H2O + Al2S3 → 3 H2S + 2 Al(OH)3

H2S has numerous names like- Dihydrogen monosulfide, sewer gas, dihydrogen sulfide, cake gas, sulfane, sulfur hydride, etc.

Other nature of Hydrogen Sulfide

H2S is contempt denser than air.The hydrogen sulfide chemistry formula is H2S or SH2.It has a molar mass of 34.08 g·mol−1H2S has actually a boiling allude of −60 °C and a melting allude of −82 °C.It has actually a pungent smell, like rotten eggs.It has a vapor pressure of 1740 kPa.H2S magnetic susceptibility is −25.5·10−6 cm3/mol.Hydrogen sulfide act as a to reduce agent.Its refractive table of contents is 1.000644
Name the MoleculeHydrogen sulfide
Chemical formulaH2S
Molecular geometry that H2SBent
Electron geometry that H2STetrahedral
Bond angle92.1º
Total Valence electron for H2S8
The formal charge of H2S0

Page Contents present
1 just how to attract H2S/SH2 lewis structure and find it's hybridization?
2 What are the electron and molecular geometry of H2S?
3 Another means to uncover electron/molecular geometry the H2S
4 Is H2S polar or non-polar and its dipole moment
6 an introduction

How to draw H2S/SH2 lewis structure and also find it's hybridization?

H2S Lewis structure consists of two hydrogens and also one sulfur atom. Sulfur is the central atom and also contains 2 lone pairs whereas both hydrogen is linked to the main atom with the aid of a single bond.

Lewis’s structure of SH2 is really valuable to recognize its electron geometry, molecular shape, number of shared pair, and also lone pair electrons.

Follow these steps to draw the lewis dot structure for H2S

Step 1: In the an initial step, identify the complete valence electron existing in H2S. Together we understand hydrogen only has actually one valence electron in its last shell and Sulfur belongs to the 16th group in the routine table for this reason it contains 6 electron in its last shell.

⇒ Valence electron of hydrogen = 1×2 = 2

⇒ Valence electron the Sulfur = 6 

∴ total valence electron accessible for illustration the H2S lewis structure = 1×2 + 6 = 8 valence electron


Step 2: Find the central atom for drawing the lewis dot framework for H2S. To identify the central atom in the H2S molecule you have two ways.

Find the main atom by finding the least electronegative atom in the H2S molecule. Clearly, sulfur has less electronegativity to compare to hydrogen since hydrogen has a higher tendency to attract electrons, also, hydrogen only demands two-electron to meet its valence shell.Place the atom at the facility which has a greater valence. Clearly, Sulfur has actually a valence power of 6 and Hydrogen has actually only 1. So, Sulfur should be paced at the facility in the lewis diagram.


Step 3: Now construct the structure of H2S through connecting the solitary bond come the main atom.

Step 4: After placing the central atom and also connecting with it a solitary bond, we have to accomplish the octet rule for every atom in H2S to maintaining the last requirement of the lewis diagram.

Hydrogen atom needs only two electrons to accomplish their octet and sulfur atom require eight electron to fulfill the octet.

The hydrogen outer shell is currently full because it shares 2 electrons already with the help of a single bond. So, no have to placing electrons roughly hydrogen.

Now because that Sulfur, we need 8 electrons yet only 4 electron are mutual with the assist of two single bonds. So, we have to place 4 more electrons around sulfur to finish its octet rule and also fulfilling the criteria for drawing the lewis dot structure for SH2.

Lewis framework for SH2 or H2S

Step 5: now in the last step, minimization the charges on atom of H2S by converting lone pairs to covalent bonds.

But over there is no fee on the atom(formal fee on hydrogen and also sulfur is zero), so, no need to make any type of covalent bond.

This lewis framework is also called Dihydrogen sulfide lewis structure or dihydrogen monosulfide lewis structure.

Hybridization of H2S

To calculation the hybridization that H2S just follow 3 straightforward steps.

1. find the variety of atoms attached to the main atom. Clearly, just two atoms(hydrogen) space attached come the sulfur central atom.

2. counting lone bag on that main atom. So, 4 lone pair electrons room present about sulfur, which means sulfur has two lone pairs.

3. add the variety of attached atom to the main atom + Lone bag of that main atom

∴ 2 + 2 = 4

So, 4 method hybridization that H2S is Sp³.

The molecular geometry the H2S is bending because the 2 lone pair electrons on sulfur main atom repel each other as well as nearby bonded pair electrons, together a result, this electron pair(lone pair and also bond pair) takes the place where the repulsion becomes minimum and they attains the stability(no further repulsion force exist in electrons pairs).

Hence, the final shape or molecule geometry the H2S appears like a bent structure or V-shaped.


According to the VSEPR theory, to minimize the repulsion. The electron pairs relocate to maximum angle apart from each other and also become stable.

Also, electron geometry because that H2S is tetrahedral due to the fact that 4 electron which make 2 lone pairs roughly a sulfur atom space arranged in a tetrahedral geometry.

H2S molecule geometry or shape

To recognize the electron and molecular geometry the H2S, that is lewis structure and also VSEPR concept play an essential role.

Electron geometry considers all electrons too lone bag to identify the geometry that H2S whereas molecular geometry just considers bonded atom of the molecule to determine the shape of H2S.

Another way to find electron/molecular geometry of H2S

AXN method is very useful to recognize electron geometry or molecular shape for H2S. Yet you have to make a lewis framework of H2S for utilizing this method.

 AXN method

A represents the main atom.X represents the bonded pair that electrons.N to represent the lone pair of electrons.

As every H2S lewis framework –

Sulfur is the main atom.2 bonded pairs of electrons are attached come the main atom sulfur.2 lone pairs on the sulfur central atom.

Therefore, the generic formula that hydrogen sulfide is AX2N2 for finding the molecule or electron geometry of H2S. 

So, AX2N2 gives the molecular geometry the H2S is bent and also the electron geometry is tetrahedral according to VSEPR shape Chart.


The bond angle of H2S is 92.1°.


The polarity that H2S is dependent top top its molecule shape, electronegativity, and also dipole moment.

H2S is non-polar due to the fact that the electronegativity the bonds(H-S) is lesser than 0.5, together Hydrogen electronegativity is 2.20 and sulfur electronegativity is 2.58 and their difference is 0.38 which causes H2S to become nonpolar in nature.

According come the Pauling scale, if the difference of one atom’s electronegativity is much less than 0.4, the shortcut is taken into consideration nonpolar and vice-versa.

H2S can also assume to be a polar molecule due to the fact that it is non-linear and also it has bent molecule geometry and central atom S is more electronegative than H, therefore, the an adverse pole is top top the S atom. So, H2S has actually some dipole moment which provides it a polar molecule.

Technically, as result of the very weak polarity nature of H2S, that is taken into consideration a non-polar molecule. 

The dipole minute of H2S is 0.95D and in the mathematical term, it have the right to be expressed as-

product of charges of 2 atoms and the distance in between them

D = Q * R 

⇒ D denotes dipole moment

⇒ Q denotes charge on atoms

⇒ R denotes the distance between atoms

Uses the Hydrogen Sulfide

It is offered to create sulfur and also sulfuric acid.It is supplied to develop pesticides, leather, and also pharmaceuticals.It is likewise used in nuclear power plants because that the production of heavy water.H2S is used in chemical analysis.It can also be used in farming as a disinfectant.

∴ The bond edge of H2S = 92.1°

Why the molecular geometry that H2S is bending whereas the electron geometry is tetrahedral?

As we already discussed, “electron geometry is established with the assist of both lone electron pairs and also bonds pair in a molecule whereas molecular geometry determined using just the bonds present in the molecule”.

According to the H2S lewis structure, the central atom has 2 lone pairs and also 2 external inspection pairs, hence, according to the VSEPR theory, H2S has actually 4 areas of density(2 lone bag + 2bond pairs) about the central atom(sulfur).

∴ four regions that electron density always form a tetrahedral geometry, hence, the electron geometry that H2S is tetrahedral.

While calculating the molecular shape, we will not consider the lone pair together “the molecular shape needs to do through the form of the yes, really molecule, not the electrons, for this reason they are not accounted because that in the sense”.

But us can’t neglect the impact of lone pair on a bond edge while calculating the molecular shape of the molecule.

As there are two lone pairs present on the sulfur main atom in the H2S molecule, hence, it will contract the bond pair, and also this renders its shape shows up like a bending structure.

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Therefore, the molecular geometry or shape of H2S is bent while its electron geometry is tetrahedral.