Which of the following elements has the ground-state electron configuration $ 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3} ? $

Question

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The given electron configuration corresponds to phosphorus (P), which has 15 electrons. The configuration $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{3}$ fills the first three energy levels, ending in the p orbital of the third energy level with three electrons, which matches phosphorus.

Which of the Following Elements Has the Ground-State Electron Configuration 1s22s22p63s23p3? 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3} ? 1s22s22p63s23p3?

Which of the Following Elements Has the Ground-State Electron Configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3} ?$