Hydrogen sulfide is a colorless gas through a molar fixed of 34.08 g·mol−1. That is poisonous and also flammable through a smell prefer rotten gas. It is also dangerous for the environment.

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

Hydrogen sulfide is created by anaerobic digestion in i m sorry microorganisms malfunction the organic issue in the absence of oxygen. It also occurs in volcano gases and also in well water also. The can likewise be derived by its separation from sour gas.

Hydrogen sulfide can be developed by when ferrous sulfide treats v a strong acid like HCl in standard lab preparation.

⇒ FeS + 2 HCl → FeCl2 + H2S

Most metals and non-metals sulfides after exposure to water they liberate Hydrogen sulfide.

⇒ 6 H2O + Al2S3 → 3 H2S + 2 Al(OH)3

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

Other properties of Hydrogen Sulfide

H2S is slightly denser 보다 air.The hydrogen sulfide chemistry formula is H2S or SH2.It has actually a molar massive of 34.08 g·mol−1H2S has a boiling point of −60 °C and also a melting suggest of −82 °C.It has actually a pungent smell, like rotten eggs.It has actually a vapor push of 1740 kPa.H2S magnetic susceptibility is −25.5·10−6 cm3/mol.Hydrogen sulfide act together a 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 fee of H2S0

Page Contents display
1 exactly how to attract H2S/SH2 lewis structure and also find it's hybridization?
2 What room the electron and also molecular geometry of H2S?
3 Another method to find electron/molecular geometry the H2S
4 Is H2S polar or non-polar and its dipole moment
6 an introduction

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

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

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

Follow these actions to attract the lewis dot structure for H2S

Step 1: In the first step, recognize the complete valence electron present in H2S. Together we know hydrogen only has one valence electron in its critical shell and also Sulfur belongs to the 16th group in the regular table for this reason it includes 6 electrons in its last shell.

⇒ Valence electron of hydrogen = 1×2 = 2

⇒ Valence electron the Sulfur = 6 

∴ complete valence electron easily accessible for drawing the H2S lewis framework = 1×2 + 6 = 8 valence electron


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

Find the central atom by recognize the the very least electronegative atom in the H2S molecule. Clearly, sulfur has less electronegativity compare to hydrogen due to the fact that hydrogen has actually a higher tendency to entice electrons, also, hydrogen only demands two-electron to accomplish its valence shell.Place the atom in ~ the center which has a higher valence. Clearly, Sulfur has a valence power of 6 and also Hydrogen has only 1. So, Sulfur should be paced in ~ the facility in the lewis diagram.


Step 3: Now build the framework of H2S by connecting the single bond come the main atom.

Step 4: After put the main atom and also connecting v it a solitary bond, we have to satisfy the octet dominance for every atom in H2S to maintaining the last requirement of the lewis diagram.

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

The hydrogen external shell is already full due to the fact that it shares 2 electrons already with the help of a solitary bond. So, no should placing electrons around hydrogen.

Now for Sulfur, we require 8 electrons but only 4 electrons are common with the assist of two single bonds. So, we have to place 4 much more electrons around sulfur to finish its octet rule and fulfilling the criteria for illustration the lewis dot framework for SH2.

Lewis framework for SH2 or H2S

Step 5: now in the last step, minimize the charges on atom that H2S by convert lone pairs to covalent bonds.

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

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

Hybridization the H2S

To calculation the hybridization that H2S simply follow 3 basic steps.

1. discover the number of atoms attached come the central atom. Clearly, only two atoms(hydrogen) space attached come the sulfur central atom.

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

3. include the number of attached atom to the central atom + Lone bag of that main atom

∴ 2 + 2 = 4

So, 4 means hybridization of H2S is Sp³.

The molecule geometry the H2S is bent because the 2 lone pair electrons on sulfur central atom repel every other as well as nearby bonded pair electrons, as a result, this electron pair(lone pair and also bond pair) takes the position where the repulsion becomes minimum and also they attains the stability(no additional repulsion pressure exist in electrons pairs).

Hence, the final shape or molecular geometry that H2S appears like a bent framework or V-shaped.


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

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

H2S molecule geometry or shape

To identify the electron and also molecular geometry that H2S, that lewis structure and VSEPR concept play crucial role.

Electron geometry considers all electrons too lone pairs to identify the geometry of H2S whereas molecule geometry just considers bonded atom of the molecules to identify the form of H2S.

Another way to find electron/molecular geometry the H2S

AXN an approach is very useful to recognize electron geometry or molecular shape for H2S. Yet you need to make a lewis structure of H2S for utilizing this method.

 AXN method

A represents the main atom.X to represent the external inspection pair the electrons.N represents the lone pair that electrons.

As per H2S lewis structure –

Sulfur is the main atom.2 bonded bag of electrons room attached to the main atom sulfur.2 lone bag on the sulfur central atom.

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

So, AX2N2 provides the molecule geometry that H2S is bent and also the electron geometry is tetrahedral follow to VSEPR form Chart.


The bond angle of H2S is 92.1°.


The polarity the H2S is dependent top top its molecular shape, electronegativity, and also dipole moment.

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

According come the Pauling scale, if the difference of an atom’s electronegativity is much less than 0.4, the bond is considered nonpolar and also vice-versa.

H2S can likewise assume to be a polar molecule due to the fact that it is non-linear and it has actually bent molecule geometry and main atom S is an ext electronegative than H, therefore, the an unfavorable pole is top top the S atom. So, H2S has some dipole minute which makes it a polar molecule.

Technically, due to the an extremely weak polarity nature that H2S, it is thought about a non-polar molecule. 

The dipole moment of H2S is 0.95D and also in the math term, it have the right to be express as-

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

D = Q * R 

⇒ D denotes dipole moment

⇒ Q denotes fee on atoms

⇒ R denotes the distance between atoms

Uses of Hydrogen Sulfide

It is used to create sulfur and also sulfuric acid.It is used to create pesticides, leather, and also pharmaceuticals.It is also used in nuclear strength plants because that the production of hefty water.H2S is supplied in chemical analysis.It can additionally be supplied in agriculture as a disinfectant.

∴ The bond edge of H2S = 92.1°

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

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

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

∴ four regions that electron thickness always type a tetrahedral geometry, hence, the electron geometry that H2S is tetrahedral.

While calculating the molecular shape, we will certainly not consider the lone pair as “the molecule shape has to do v the form of the really molecule, not the electrons, therefore they space not accounted for in that sense”.

But we can’t ignore the effect of lone pair ~ above a bond angle while calculating the molecular shape of the molecule.

As there space two lone pairs current on the sulfur central atom in the H2S molecule, hence, it will certainly contract the shortcut 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 when its electron geometry is tetrahedral.