So we're going to say okay let's make it easy on ourselves let's say it has one more electron awesome. This is such a pain, so an easy way to do this, is if you look at the periodic table, here is francium right here, the noble gas before francium is radon, radon has 86 electrons, francium only has one more. But what if we come across an element that has 87 electrons such as francium, that has a ton of electrons and I don't want to have to draw all of this out. Okay so which is the same thing as electronic configuration just a little bit shorter and easier to write, easier to manage. And we're going to call these two, this one and this one the noble gas configuration. Okay let's take chlorine which has a little bit more electrons, chlorine if we just simplify this into electronic configuration we'd say okay chlorine has a 1s2, 2s2, 2p6 again same as neon so instead I'm going to just write neon, 3s2, 3p7 so this is the electronic configuration for neon. So instead of writing this again the whole thing I can just write it well sodium has the same electronic configuration as neon plus a 3s 1 electron easy enough. So this makes it a special kind of atom or element, so down here this is one more electron than sodium, so instead of having to rewrite this whole thing, notice that this electronic configuration is identical to this one, there're the same. Well there's something special about neon, neon we know it's a noble gas meaning all the electrons are filled in the outer of shell. Sodium has 11 electrons in its neutral state, so okay so awesome, we're going to say this has 1s2, 2s2, 2p6, 3s1. So this is basically electronic configuration.Īlright so let's do something a little bit more complex, lets do sodium. In the 2s orbital, I have 2 electrons again the superscript of 2, in the 2p orbital or sublevel I have 6 electrons so I'm going to make a superscript of 6. Instead of having to draw all of that out, I'm going to do a shorthand version and say okay in that 1s orbital we have two electrons so I'm going to make a superscript of 2. So let's start with neon, we know neon has 10 electrons in its neutral state so, and when I do the orbital diagram this is what I got with 10 electrons drawn out. So before we talked about orbital diagrams and up here we actually have a bunch of orbital diagrams, but instead of having to write all of this out to describe where electrons go and how they fit into the atom we're actually going to make it shorthand and that way we're going to do electronic configuration. Electronic configuration is the arrangement of electrons in an atom. Alright let's talk about electronic configuration.
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