[Music] Hello Friends in the previous section we have discuss about the ionic bond and that is we have taken example of the formation of the emission that how emmision bodies perform but in actual practice there are various steps that are been taking place and because of which the NSA is reformed so now we are going to talking about basically a small example that is in born have a cycle for the formation of NSA so let us talk about it and let us see that how the ionic bonds are formed so now we are going to discuss about the born-haber cycle for the formation of any scene and that is the reason that because of which consists of a electro positive that is element or electropositive atom that is sodium and that of two negative atoms that is chlorine atom and they combine with each of those Wells perform NAC but there are meanest person that takes place in this case and so let us understand it so by talking about the gender reaction we could say that sodium which is of the solid phase and we combine with that of the molecule of that is chlorine and so as to form busy NaCl and this anything is the one that is been formed and that is formed because of sodium has a positive charge but fluid has a negative charge but mean like in this case the amount of energy is also being that is liberated and that is the reason that if we could say that the Delta H formation or the heat release during the formation of Eddie’s here that is what we have written over here and that is it was been found to be minus three eighty one point eight kilo Joule so this much amount of energy is being released when sodium combats with that of the chlorine gas but this doesn’t explicit I agree we have to give a following steps that are involved in the formation of any C and let us start with so talking about the first step so the first step that is what we do is we convert the sodium atom into its iron and that is what it is known as sublimation so we are doing the submission process where the soil phase of celebi’s been converted into the gaseous phase so now the first thing that we could write it over here as sublimation of sublimation of sodium so in this process basically what happens is that is sodium which is present in a solid phase it is been converted into that is n a which is basically a gaseous phase so therefore this will be converted into that is the process is known as subdivision so we would write it over here and that so it faces being converted into that is gaseous phase and the amount of heat that is being required and that is basically you could write it because if we are doing the sublimation processes therefore Delta H of having a subscript s that indicates that is the summation process that has been taking place and that is the reason that plus one zero eight point five kilo Joule of energy spin required so as to convert the sodium which is no solid phase to the gaseous phase and this is the first time that we have did I talk about the next one that we can do yes we can do that is the second step is what we are going to mention about and that is basically so this is the thing that we have did for that is sodium but meanwhile we can also discuss it or chlorine and the chlorine atom or that is what we need because any will combined with that of CN switched form in this way so but the chlorine gas is being that is the it is in the form of that is gaseous phase so that is what we have to do that is we have to dissociated so if we dissociate then only it will be converted into that is chlorine atom so in this process that is step number two build issue fitted so I will try to eat over here that is we are good that is this is the one that is undergoing the association so as to form that is CN which is of gaseous phase so this step two is what we have and that is the amount of heat that is been required so as to disturb form the dissociation is basically in this form to be that is one twenty one point five kilo joule and the second step is basically known as dissociation of 4c so this is what we have or we could say association on her people to say that is atomization so in that case the Buddha’s aim and this is what we have got over here but the thing is we have to again this sodium and this chlorine they won’t react it directly because they are in the atomic form and not in the ionic form and we know that that they form the ionic bond and so the first thing that you do is you have to convert them into ions and in that case also the amount of energy would be required so as to convert them into oils so the first thing is we would convert sodium into its iron and will convert that is Cle that is chlorine atom into its sign and then we will combine it so the second though so the third step is basically ionization of that is sodium so what happens in this process is basically sodium which is off the gaseous phase it’s been converted into basically a McClure’s by liberating one electron so now this is the one that is informed that is sodium and has been for many this is of gaseous phase so in this case the energy always it is windier and that is nothing but the if we could say like the ionization enthalpy so that is been needed so as to remove the electrons so we could also name it as I am in strength of that particular sodium or we could say like Delta H also yeah I have written it s I so the amount of energy that is required so as to remove this electron and it has been found to be that is four nine five point two kilo Joule of energy has been required so as to remove the electron and this is what we have and the second thing that if your previous we have to convert the chlorine atom into a chloride ion and that is what we are going to discuss about and that is step number four and that is the that is again becomes a ionization of four that is chlorine atom and in this case basically the chlorine will have to accept the later because chlorine is the one which is not a term negative so it has the tendency to gain electrons unlike sodium which has that I need you to give me electrons so in this case BCD I will write it in this way that is flowing which is off the gaseous phase it will have to accept an electron and then only it will convert into CN minus sign and that is also of the gaseous phase but mean right it is not giving its electron so we are not ionizing it term off by removing later on but in terms of gaining electrons so that is the reason that we could name it as electron gained enthalpy so we could write it as eg electron in enthalpy or electron affinity that’s the tendency of community to accept and that is how in this case the energies not be enough it need it don’t need an energy so it’s true the word things CL into CL minus but it releases the energy and that is what you could see that the electron gain enthalpy has a minus sign and that is having that is 3 4 8 4 3 kilo Joule of energy has been released when an electron is combined with that of a chlorine atom and this is what we have so if you observe that our main motive is finding that is we have caught the na plus and that is CL minus so the thing is very clear that is a you could see that na will combine with that of CL source to form any CL so let us do the fifth step and the fifth step is I would write it over here s that is formation of any scale and that is how it forms that is any bliss that is what we have obtained along with that of the CL – that is what we have obtained during the process and this is how the any sale has been formed because of the electrostatic force of attraction and obviously the energy would be released and that kind of energy is basically denoted by Delta H and this Delta H gives the lattice energy of these people say the overall any same molecule between the NS in molecules so the amount of energy that has been needed to form that is NEC and so that is what the letters energy is so this is what we have port over here and let us see that what we have discussed in this overall formation of hennessey so just a small glimpse of it that is what we have today is the sodium which was present in the solid phase along with that we have combined with the half moons of that is cl2 gas so as to obtain that is NEC along with that obviously some amount of heat has been liberated during this formation and that is basically Delta HF but in this case basically what we have did is we have converted the sodium which is of solid phase into that is sodium which is of the gaseous phase and that is what here the energy that was being spent it was the sublimation process so I would write it over here sublimation and meanwhile we have converted the chlorine molecule to its iron ore to its Adam so that is what the atomization process has taken place over here of you provide it as dissociation so we named it as association so now in this case we see the chlorine has been turned into a molecule that molecule it has been turned into an atom so now the rest other thing is we have converted this sodium into that is na plus and in this case we see the energy required to renew the electron and that is an addition that what we have did by to move enough electron and mean when the fluorine gas was again converted into BC an iron but in this case it has gained electrons so I would name it has taken in enthalpy and that is what we have got over here so now this the both two of which they have combined that is so as to form that is NEC so this overall energy that has been required so as to for any NCL that was that is lattice energy and that has been denoted as post capital K so in this case basically what we have got to know that various kind of energy that has been required so as to give a particular amount of heat and that is what you could say that is the Delta HF at the heat of formation of venison is basically on the combination of the various energy that will be involved in this case and we could write that the energy that will be involved it was basically sublimation so we didn’t like to do here’s a batch of subdivision along with that dog for death edge of dissociation along with that buffs we could say that is Delta H of ionization along with that of the Delta H of electron in ethyl P or electron affinity and ultimately that is what we have got a lattice energy and that is we could leave it as this one so therefore we would say that the overall lattice energy is what we could say that it can be easily calculated and that is p cv if we combine the HF along with that of the whole thing will be on one side and this will be basically Delta H s along with that of Delta H D plus Delta H fine Delta H of each so we see we are doing it from an island term and so as to understand that what is the lattice energy between the sodium and the CL and so suppose if that is what we do know but even we can take with that one so the Delta HF was it was been found to be that off that is minus 3/8 one point eight along with that of the 10 days of be cool to see a deaf – of some Domitian’s it was been found to be that of four that is one zero eight point five and if you combine with that of the dissociation comes dissociation the energy required to dissociate it so that’s what it was for will be 120 145 at that of the ionization it was specially for 95.1 in enthalpy and it was want to be basically that is of minus three four eight point three illusions so if you combine this thing then let us see that is what is the answer that we could get so we have got that is – seven 58.7 clinching so this is the lattice energy of between sodium and chlorine Florida and that is what we have understood and so this is the thing that has been formed an ascending scale is involved not only by sharing the electrons but overall in this process so that was a short the thermodynamic term that we have later here and that’s it this is what I want to talk about so thank you friends for watching this video I hope you have understood this will be 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