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Okay what let's try this one just follows those rules that we just talked about atoms wanting to obey the octet rule so remember that wherever you are on the periodic table it kind of determines whether you want to go backwards or forwards in gaining or losing electrons so all you got to do again is just look at the periodic table is your cheat sheet here, and it'll tell you what the most probable charges, so you look at the number of valence electrons each of these has so let's just do that and then see if it would be easier for me to get to eight or zero or easier for the particular atom you did eight or zero so how many valence electrons does potassium have well one right calcium's got two aluminum got three so remember we want to have a full octet or have no valence electrons or eight electrons what you want to look at it bromine is got seven sulfur at six all right phosphorus has five, so this is kind of a perfect problem it's a good array of atom, so you can see and in fact whenever you got like alkali metals or alkaline earth metals or halogens or whatever you know they all obey essentially the same principle, so they all have the same number of valence electrons you know, so they're all going to make essentially same ion preferably so anyways let's go with that assumption and say well is it easier to get to eight or zero so, so zero will say which is easier zero or let's do this zero okay so here it's going to be zero right err again that's going to be 0 and here well takes five to get to eight or three get to zero so zero here perfect to eat, so it's going to be a hey, hey, so you could determine the charge by how many electrons you lost to get to that number or how many like how much you gain to get to that No so here we gain one electron right because 8 minus 7 is 1 so or if you want to do it this way 7 minus 8 equals negative 1, so that's the charges of that if you know about Lewis structures right bro means Lewis juncture was that, and then you add it in electron so 6 minus 8 equals negative 2, so that's what you're going to have here and in fact if you look at the Lewis structures of all these they're going to have that full I'm Ted what do you think here obviously right 3 3 minus and remember in chemistry it's conventional to write these backwards as 3 minus 2 — well you don't okay so here right we had one electron or two electrons or three electrons right we're going to zero electrons so 1 minus 0 over 1 minus 0 plus 1 plus 2 Plus 3 is we're going to lose those electrons, so we went from this right — I meaplectrumum but since we lost that one electron we gained a charge game deposit lost two electrons to + remember no one, and it's convention to write the two first in here okay, so that's a pretty good survey of the periodic table
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