 So let's start with this one as our first one of the day What is the electron configuration of fluorine or F? Okay, so again, if you Need to memorize the names Florian's a good one to memorize those Are the symbol of these elements because you'll be seeing a lot of it in Introductory or general chemistry, but so anyways Yeah, right Then it asked what's the electron configuration? So you just use the periodic table just like what we went over so One s two right because that's how many electrons can fill up an s orbital and You look at the periodic table. There's only two electrons in that first energy level then The next one the next energy level is the two And equals to energy level right so two s so two electrons compared in there again, this is why the left side of periodic table that columns sticking up is called the s block those two columns and on the right side of the periodic table remember we called it the p-block right so It's still in energy level two right to p and then with fluorine all you got to do is count how many electrons Have a place there so one two three four five So so that's the full electron configuration. So how many valence electrons does fluorine have so you just look at the Last Period to get the valence electrons of the energy level to n equals to so Valence electrons so of these electrons well you have all of these ones What's the total number of electrons to put this so the total number it count those up. There's two These two in our electrons here. Where are they? Well, it was one in this one can actually hold eight So flooring to there's something called a Lewis structure I guess we could go over right to Designate how many valence electrons we go one and that's the Lewis structure for flooring this actually is very Useful for later. I know it seems rather So you can get a lot of configuration and again this is the first problem, but I guess we should do the Condensed electron configuration to convince the electron configuration is you just take the valence electrons right those the same way so to us to 2p5 and you take the inner electrons right and Just instead use the gas symbol and brackets I know it doesn't look very condensed right now, but when you get to like higher atoms Like high diner bromine or something like that Okay, anyways, we'll do some more of these