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Phosphorus

To determine an element from its electron configuration, simply add up the superscript numbers (those are the numbers of electrons in each sublevel): 1s22s22p63s23p3: 2+2+6+2+3=15, and find the element with the matching atomic number*. In this case, Phosphorus.

*Note: This method is not correct if the electron configuration of an ion is given, as the number of electrons in an ion does not match its atomic number.

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