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If the question asks you to find the configuration of an ion you would have to first find the configuration of the neutral atom and then account for the charge of that ion. For example if it is a - charge you add an electron and if its + you remove an electron.
You would normally find the electron configuration and pretend like it does not have a + or -. After finding the normal electron configuration, you can go in and add or remove an electron. The only time you would not be able to look for the normal configuration in the periodic table is if you were looking for an ion of Cr or Cu which are the exceptions. For Cr, you would use 3d5 4s1 instead of 3d4 4s2 and for Cu, you would use 3d10 4s1 instead of 3d9 4s2. You do this for these specific elements because it's more stable to have a half full (d5) or a completely full (d10) orbital.
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