Total # of electrons from electron configuration = Atomic number (ground state)
Identify the element: An excited state of this element has the electron configuration 1s2 2s2 2p5 3s1.
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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.