H2S or hydrogen sulfide gas is colorless in nature. With numerous other assorted pet names like sour gas, sewer gas, and so on this gas is poisonous and corrosive together well.

You are watching: The molecular geometry (shape) of sh2 is __________.

I am sure you room not expecting a an excellent odor native this gas! fine yes, you room right, hydrogen sulfide gas smells like rotten eggs!!

The molar mass of H2S is 34.08 g/mol and also its density is 1.363 g dm-3. The melting point and boiling suggest of H2S space -82℃ and -60℃ respectively.

H2S has actually a covalent bond because the sulfur atom completes that is octet by share 2 electrons v 2 hydrogen atoms and also thus forms a covalent bond.

I have likewise written particularly on it, examine out the short article on the covalent bond of H2S.

Let us examine these fundamentals with the explanation of the lewis structure of H2S.

H2S Lewis Structure

The lewis structure of H2S is as below.


Now to recognize this we need to understand the procedures to attract a lewis framework at first.

First and also foremost it is necessary to recognize how numerous valence electrons are existing in the compound.

In this compound valence electron will certainly be as following:

Hydrogen valence electron = 1

2* Hydrogen atom = 2

Sulfur’s valence electron = 6

Thus total valence electron = 2 + 6 = 8

Now the next work will be, finding the end the main atom.

The main atom is basically the atom through the highest number of bonding sites. Here, the main atom will be the sulfur atom.

After finding the main atom we have to sketch a skeletal structure of H2S with single bonds only.

It’s good to understand that lewis framework is all around electrons and also atoms fulfilling your octet. Every atom do the efforts to meet its octet to achieve stability.

In this compound, sulfur has actually 6 electrons, therefore to achieve octet i.e 8 electrons, it demands 2 more electrons. Similarly, hydrogen has actually only 1s shell and also its octet have the right to be filled through 2 electrons only.

Thus hydrogen requirements only 1 much more electron to gain stability.

Now the following task for illustration the lewis framework of H2S will certainly be filling up the staying electrons (after the formation of solitary bonds in the sketch) about the sulfur atom.

Lastly, we need to check that all atoms are having their lowest possible formal fee to finish the lewis structure of H2S.

For make this entirety learning about drawing a Lewis structure, a bit an ext simple, I have actually jotted down the actions below.

Step 1: discover out the total variety of valence electrons in the molecule. Do take care of +, – indicators while calculating.

Step 2: Choose a main atom; generally the atom through the greatest bonding sites.

Step 3: draw a skeletal framework with solitary bonds only.

Step 4: Fill upthe octet that the atoms with the staying electrons. Store in psychic to start with the electronegative atoms and also proceed come the electropositive one.

Step 5: Give multiple bond if forced for fulfilling the octet that the atoms.

Step 6: At critical make sure all the atoms are having actually their lowest possible formal charge. You deserve to calculate the same with the formula provided below


Moving on to the following topic, let’s placed some irradiate on the hybridization of H2S!

H2S Hybridization

According come Drago’s rule, H2S has actually no hybridization.

Drago’s preeminence – This ascendancy states that no mix of orbitals or we deserve to say no hybridization takes ar if the power difference in between the atom orbitals of the atom is as well high.

So there will certainly be no hybridization that the main atom. There are specific conditions because that this preeminence to come into action, lock are-

1. The main atom must be present in the third period or listed below the third period, v at the very least one lone pair.

2. The neighboring atoms should have electronegativity listed below or same to 2.5.

3. There have to not be any type of positive charge existing in the central atom.

This preeminence is valid for 6 molecules ie; PH3, AsH3, SbH3, H2S, H2Se, H2Te

Well surely, H2S does pass all the conditions.

The main atom i.e sulfur is in the 3rd period, it has actually 2 lone pairs and no confident charge. Also, the electronegativity that hydrogen is 2.1.

Thus this describes that H2S has actually no hybridization.

Moreover, including to this rule, one more factor is the the vacant orbital of Sulfur and also 1s orbit of Hydrogen has actually a very large energy difference.

So over there is no hybrid orbital formation. Thus, this is one more explanation saying, H2S has actually no hybridization.

H2S Geometrical Structure

The molecule geometry of H2S is bent.


Another important allude is the electron geometry of H2S, i beg your pardon is tetrahedral. Now prior to jumping into the difference between these two, let united state see exactly how to find them.

So, both the geometries have the right to be found from the VSEPR chart. The chart is attached below!


From this chart, we have the right to see that H2S is an AX2E2 type molecule, whereby X represents the neighboring atoms and also E represents the lone bag of the central atom.

Thus, we can say the the molecular geometry of H2S is bent.

Moving to the difference between electron geometry and also molecular geometry.

Basically, molecular geometry only takes right into account the atom of the molecules while determining the shape. Whereas electron geometry considers every the electrons present.

The later one considers the lone pair together well, which causes the significant difference in the shape.

Another allude to save in mind is that the repulsion between the 2 lone bag in H2S additionally plays a significant role in making its bent molecule geometry.

The repulsion transforms the bond pairs from a right to bent shape.

All these explain the molecular geometry of H2S.

H2S Molecular orbit (MO) Diagram

The molecular orbital diagram the H2S can be explained in the adhering to way.


This is the MO diagram of H2S. The left-hand side will contain the atomic orbitals the sulfur i.e 3s2 3px2 3py1 3pz1.

And on the right-hand side, there will certainly be atomic orbitals the hydrogen.

8 valence electrons space filled in the MO orbitals. There space two non-bonding orbitals existing as well. The anti-bonding orbitals space vacant and bonding orbitals are filled.

From a MO chart of H2S, we can gain to know about the bond order, shortcut length, and also bond stability of the compound as well.

Also, it need to be maintained in mind that the vacant orbitals of sulfur and also 1s that hydrogen have a big energy difference. However the MO diagram have the right to be developed after that together well!

let us additionally study the preparation methods of H2S in the below subtopic.

Polarity the H2S

The molecule H2S is considered to it is in a polar molecule as the molecule has a bent shape. The dipole throughout both H-S binding does not cancel out each other and has a net dipole moment.

For more detail, i request you to additionally read once the post on the polarity of H2S.

H2S Preparation

Hydrogen sulfide deserve to be developed in different ways, few of those are,

The most common method is the preparation from cake gas (any gas having high H2S content).

Hydrogen sulfide deserve to be derived by treating hydrogen v molten elemental sulfur at ~450℃.

Lab preparation – reacting ferrous sulfide and a solid acid in Kipp generator.

FeS + 2HCl ——-> FeCl2 + H2S

Another qualitative analysis, where thioacetamide is offered to produce H2S.

CH3C(S)NH2 + H2O ———> CH3C(O)NH2 + H2S

6 H2O + Al2S3 ——–> 3H2S +2 Al(OH)3 is an additional reaction for development of hydrogen sulfide.

Now, we all understand H2S is offered in many reactions because that the formation of various compounds.

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For straightforward understanding of this reactions, we require to very first have an idea about the structure, bonding, and also hybridization that hydrogen sulfide the are explained above!


This article revolves about the lewis structure, hybridization, bonding the H2S. These things are really essential to know around so the we can learn equations entailing H2S smoothly.

I expect after reading the write-up you obtained a little bit that knowledge about this compound. Though over there is a lot an ext to learn, it’s good to go action by step! ~ all, chemistry is a very substantial subject!

If friend have any kind of questions about any object in this article, feel cost-free to questioning me the end anytime!