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In this equation, delta x gives you the range in which the electron can be/ the electron's uncertainty in position, so you would need to divide it in half to get the +/- value. An easy way to think of it is to think of the example that Mr. Lavelle showed us in class where for the H- atom, an electron is confined to its nuclear diameter, 1.7E-15 m, which is the delta x/ uncertainty in position in this problem.
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