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D3. The atomic number 2,4,8,15 and 19 are given for the atom H,l,J, Kand L respectively:(a) Explain the chemical bond formed between the nonmetal belong to the thir...

Question

D3. The atomic number 2,4,8,15 and 19 are given for the atom H,l,J, Kand L respectively:(a) Explain the chemical bond formed between the nonmetal belong to the third period and an element having valency +2 (3 marks)(b) Draw the electron dot diagram of gaseous element with valency 2 and also of element having one period. (2 marks) (c) Mention the number of bond pair and lone pair of electron for the element that is used in breathing: Draw the structure also_ (2 marks)

D3. The atomic number 2,4,8,15 and 19 are given for the atom H,l,J, Kand L respectively: (a) Explain the chemical bond formed between the nonmetal belong to the third period and an element having valency +2 (3 marks) (b) Draw the electron dot diagram of gaseous element with valency 2 and also of element having one period. (2 marks) (c) Mention the number of bond pair and lone pair of electron for the element that is used in breathing: Draw the structure also_ (2 marks)



Answers

Each of these molecules has fluorine atoms attached to an atom from Group $1 \mathrm{~A}$ or $3 \mathrm{~A}$ to $6 \mathrm{~A}$. Draw the Lewis structure for each one and then describe the electron-pair geometry and the molecular geometry. Comment on similarities and differences in the series. (a) $\mathrm{BF}_{3}$ (b) $\mathrm{CF}_{4}$ (c) $\mathrm{NF}_{3}$ (d) $\mathrm{OF}_{2}$ (e) HF

This question is about Lewis structures and geometry. So let's start with our first compound be F three. And I'm gonna show you a little shortcut for joining ago. Structure for this, um, we can start by putting our boron in this center. Yes, they will give it the three families electrons it comes with. And we will put the Florian's in the side with Southern Valence electrons. They come with act, and we know we can just drop on using the valence electrons of this poor on this. I'm trying to find this boy is going to bond with this glory in this barn is gonna bond with that for aid like trying and so on. So our final structure looks like this. Uhm, I'm going Teoh recharge so that it looks a little bit neater. So we have born child. All right. Okay. Now, what is the geometry of this compound? Well, we know that the born is bound to three atoms, So this is a tribunal plainer geometry, and the bond able is 120 degrees. My next structure is going to be carbon. It's ah, carbon trying fluoride. And so the structure will look like this pants. This is a tetra hydro geometry. The electron and molecular geometries are the same because all the electrons are bonds. And so the bond angle for each of these is 100 and 90 degrees. Not stuff we have pf three. So we have who have phosphorus in the center. Uh, we have three foreign molecules permit before in Adams, and we have your lone pair. So this is a Tadahiro electron structure, but it tribunal pure middle molecular structure. Next we have, oh, up to, and that is simply a linear structure. And lastly, we have each and that is also in than your structure. It's only got two Adams, so you draw a line between two points. It's late here, and that's it.

And here we will discuss the design question. Each of these molecules has chlorine atoms attest to an item from a. R. Three A 26. Draw the life structure for each one and then describe the electron pure geometry and the molecular geometry. So first people discuss the levee structure for the given molecule levy structure. Then electron pairs geometry and then molecular geometry. So in molecular geometry we will discuss only bonded atoms. And in electron pure geometry we will discuss Berlin peers and bonded atoms. This is larry structure, electron pair geometry and molecular geometry. Part A. S behave part a barren trifle, right Islamic structure is baron trifle ride Borroni central Atom having born with three Florina tum. And here chlorine atom having lone pairs. And here electron pure Geometry is no long piers. These are bonded atoms three here and so it's molecular geometry will be Trigana planet. Try gonna planner and next one is in part B. CFO. Islam structure is flooring, flooring, flooring and florentine having known peers Lauren. Uh huh. There is no longer appears in the central item for wanted items. So use molecular geometry will be um Detrol. Hero hydraulic geometry. Next is in farsi And we have given molecules n. f. two. It has level structure is and if and if three N. F. Three. Central element has long pierce and then Lorene chlorine and Florence. So it is a Detroit federal electron pairs geometry. Tetra head roll due to this long pair and it's molecule a geometries. Yeah. Try gonna bye by remedial by the middle huma tree. Next days in body. Or if to islam structure is oxygen central adam and having chlorine due to the repulsion of these two long piers. The structure is paint so its molecular structure is bent and it's an electron pairs geometries, tetrahedron and we have lost given monkey Elise HF isla vista Joey's. This and its electron pairs geometry is Trigana fry Gunnell by pyramidal and its molecular geometry is linear. So these Hollywood while killers you may treat electron pure geometry in levy structures.

We're going to start by drawing The loose structure from part A. So we have BF three Boron is a central atom and it is bound to three florins. This has an electron geometry of tribunal planner. Since there are three electron domains and the molecular geometry is the same since there's no long pairs of electrons on the boron. Um to change the shape For part B. We have CF four. So central adam is carbon And it has four bonds to four. For ins Yeah, the electron geometry, yeah is tetra hydro. And the molecular geometry is also tetra hydro. Again, since there's no lone pairs of electrons on the carbon that would change the shape Or NF three. The loose structure, we will have a nitrogen bonded to three florins and we'll have one lone pair of electrons. So for the electron geometry we count the number of electron domains and there's four, there's three bonds in one lone pair. So this gives an electron geometry that is tetra federal. But the molecular geometry in this case is different since the lone pair of electrons impacts the shape. So this gives a shape or a molecular geometry that is tribunal pyramidal. For part do we have the left to, we'll have our central oxygen bonded to two florins and it will have to lone pairs of electrons to find the electron geometry. We count the number of electron domains and there's force. That means the electron geometry is tetra federal. In the molecular geometry or the shape is bent. And for HF we simply have a hydrogen bonded to a flooring. You can draw in the lone pairs on the flooring and the electron geometry is linear and the shape is also linear.

Let's draw the Louis structure for nitrogen tri fluoride or NF three. We're also going determine its electron pair of molecular geometries and do some hybridization work. First, let's determine how many electrons will be present in the structure. Five for nitrogen, seven for each flooring. This equals 26 electrons that need to be accounted for. Let's start by putting nitrogen in the middle and putting three florins around it. Next, let's draw in all electron pairs to make sure that all atoms have a narc. Tep. Next, we want to count up. How many total electrons there are to make sure equals 26 246 for each florin. Times three 18 plus two on the nitrogen plus 246 for each single bond gives us 26 total electrons, so this is the correct structure. Next to determine geometry. First, we want to determine how many total electron groups there are. I'm going to redraw structure all in black. So around the center Adam the nitrogen, therefore electron groups. So for the electron pair or Elektronik geometry, this is Tetra Hydro. Next, we want to determine how many of those groups are bond groups or uh, electron pair groups. As you can see, we have three bonded, one lone pair. So with that lone pair that gives us the tribunal perimeter wall Molecular geometry. We also want to determine what hybridization of the nitrogen atom is, so I'll just draw the nitrogen here. It has four groups around it. This gives us the S P three hybridization and for each of the florins, those also have s P three privatization.


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