Lifetime Measurement of Excited Atomic and Ionic States of Some Noble Ias Ac Form

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okay this is the last installment in the video series on electron configurations and here we are going to talk about the electron configurations of main group ions and also of excited States okay so the first topic is the main group ions we're going to stick with oxygen as our example this should be familiar to you by now oxygen has two electrons in a helium core and then it's got two electrons in a 2 s orbital and four electrons in the 2p orbital of the valence shell so we write it as helium 2s2 2p4 in standard notation if we now consider making that the oxide ion we're gonna add two electrons right remember that oxide is the only ion that we expect to find of oxygen in compounds Oh to minus so we've added two electrons and that ing to the nearest noble gas rule is what we would expect it's two columns away from the noble gases so that means we need to get minus two and so now you see what actually happens is that we've added those two electrons to pair in these two vacancies in the v