Problem

Write the favourable factors for the formation of…

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Problem 5 Easy Difficulty

Define octet rule. Write its significance and limitations.

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Chemistry 101

NCERT Class 11 Part 1 - Chemistry

Chapter 4

Chemical Bonding and Molecular Structure

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Video Transcript

So the question here has asked us that what is of great room. Okay, so I'll explain to you in terms of concept what happens is that our terms I did give or accept? Okay, or even share electrons or even share electrons two achieved noble gas configuration. Okay. To achieve noble gas configuration. This it's called object rule where the sharing accepting or yeah, donating items. Yeah, achieve it electrons and outermost shell. Okay. Does are telling stability. Okay, that's attaining stability. Now we want to know what is its significance. Okay, what is it significance? So earlier we did not know the we did not know why items combined on shared electrons among themselves. All right. This concept of octet rule helps us understand the reason. Okay. Help us understand the reason as to why this combined to form ionic or covalin bombs. All right now we want to know what are the limitations. Okay, so I'm just getting but erin because of course they have limitations. Unintended. So let's see. First is the hydrogen molecules. Okay, hydrogen molecules, What happens here is we want to talk about dr tools off turtle means it Electrons right? But hydrogen here has only two. You can see it. It has only two electrons and it's outermost or the shared violence. See Okay, so does not fulfill of state rules. So this is kind of anomaly or exception. Okay, so this is the first exception here. Let's go to the second one. Okay, shall we have incomplete objects for the central item? Okay, how do we know this? Let's see. Let's see for a compound they have have BF three. This is a molecule. So here we have Bronn. We can keep flooring over here since boron has three electrons in the outermost shells will place it this way, I'll take on the front from flooring each and place them here. And since flooring has shared. so now it's well, N. C. Is complete Because it needed only one electron eat extra. So now the flooring has its valence he completed here as well. Because you can see now Flooring has eight electrons here here also. Flooring has eight electrons. And here also. Flooring has eight electrons. What? Look at boron, boron has only six electrons in its outermost shell. 123456 It did not reach it. You can see this does not not done the object. Okay. Does not fulfill the octet rule here. So let's move on to the third part. Our third part here will be expanded. Well, object on central item. Okay, I'll give you the example for this. You have certain compounds it. S P F five, Okay. Or SF six. All right. RIF seven. These are the These other examples. Okay, we're the center like and will have an expanded doctor where you can see here since Iran already has seven electrons in its outermost all but it just needs one. But due to seven flooring it will Iran will have got a lot 14 electrons in the outermost shell exceeding a right. So here this is an animal ear exception. Moving on to the next one. You can see they're all electron molecules or electron molecules. Okay, let's see how does this happen? And forward There are compounds like N. O nitrogen dioxide. Okay. And then we have here in nitric oxide as well. Okay, These compounds have our number of electrons. Okay. And does not fulfill the object for one or more attention. The molecule. Okay. Also we know that according to DR Truell according to update rules, the nobody that says do not react right. Global gases do not react. However, however noble gases have been found, noble gases have been found to make bonds and form compounds. All right. Such as such as Keilar two XEF two X E O F four XEF six etc. Okay. No one more an exception here. Is that does not Oh, come on for shape of molecules. So if you have read the actor tool properly, you will notice that the actor tool does not account for The shape of the molecule that has been formed. Okay. And also the 7th 1. Okay. And one of the most important one is that it cannot explain the related stability. Okay. Of the molecules. Okay. And tom's off energy. Mhm. These are the limitations here. Okay, we have limitations. We have seven limitations in total here. We have significance here and then we have DR rule here. If you have any further doubt, please let me know. I'll be happy to help

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