hello Learners and welcome to the final part about transition medals and coordination chemistry which is Crystal field Theory like the beginning of every new part I wanted to remind you of the pre lectures and one pages and the previous information section so of course you want to go to the pre-lecture area here you want to make sure that you are completing the pre-lecture one pager to orient your brain and of course you also want to make sure you are reviewing Concepts and completing practice problems for all the previous chapter information so if you are having a hard time making those small connections with details this is where you need to go back and do so yes it is extra work but it's all about making sure you are completing the learning process if you really want to understand this material now again the goal of the lectures will be to enhance or add to pre-lecture information but I also want to tell you that yes it can be easy in this day and age to find a quick answer for most anything but you must also consider giving yourself and your brain a chance to learn something new meaning that you have to go through the Journey of not getting it before you get get the answer right so I will say be okay with failing and getting back up and trying again because that is a part of learning chemistry and it will be worth it over time the Hard Road is always going to become easy and the easy Road will always become hard so let's get this final part started America's Next transition medal is on to another challenge so so far in the last two parts we have learned about transition medals and their property and went further to learn about how transition medals can bond with lians to form complex I ions with different geometry now let's continue to imagine that transition models are going through another challenge called the complex ion exploration challenge where the models must explore how complex ion bonds are formed why Ser geometries are preferred and why these complex ions exhibit new properties like color and Par magnitude and the transition models can only use two theories to make their explanations for our course which are veilance Bond Theory which helps us explain basically bonding and geometry and a new Theory called the crystal field Theory which is all about understanding how D orbitals split and energy to create those new properties like color and Par magnitude so as we can see here in this photo we basically get a visual of what the crystal field theory is based on so here we have these D orbitals okay and um this is going to be part of a d orbital diagram so we just just write those little lines to help us and we know that all these D orbitals are going to be basically the same energy but we know that each orbital has a different shape okay so when liting are going to be approaching these different shapes of these different orbitals um of course the energy is going to increase so we have our D orbitals here and see the energy kind of increasing and this is the energy diagram so we do see an arrow of energy going up here and so again when the lians approach the different de orbitals of course that are part of the metal ion because we are talking about a metal ion Lian Bond because we are talking about complex ions just like we are from the last portion right we're adding another layer so when those um lians are going to start approaching these D orbitals of different shapes the energy of the orbitals are going to increase as we see here energy increase okay folks but we go further right even though yes the energy is going to increase based on the shape of the D orbitals and we have different shapes some shaped D orbitals are going to have different energies than other shaped de orbitals so what happens is our de orbital energies are going to split so we have two shapes that are going to be higher in energy and three shapes that are going to be a little bit lower in energy okay based on the octahedral complex ion that our of course mainly focused on so of course there are different geometries we saw in the previous portion but remember for um just to explain to you right now for our portion when we focus on crystal field Theory we're only going to be talking about opct hedral complex ions mainly okay and this splitting of these Z orbitals is what helps us understand complex ion properties like um the color and paramagnetism which we already talked about is based on crystal field Theory and so we're going to basically get into learning all about this soon so let's continue to make connections and get more understanding so to begin our journey we're going to use veence Bond Theory to create new hybrid orbital that help us describe bonding and geometry in complex ion that's what we're going to start with but we need a new model called the crystal field Theory to help us describe properties of complex ions like color and magnetism so that's what we get into next okay as a bonus once these new properties are unlocked our transition models get makeovers and we get to see some of them pretty much shine with different colors okay and finally I just want to make sure that you're always looking out for those flash card moments throughout the lecture and that just means you want to stop and give yourself a chance to actively write down a concept on the front the card and an example definition or visual on the back of the card about what you just learned so let's get into it