AP Chemistry
1.5 Atomic Structure and Electron Configuration
A sample of a neutral gaseous element absorbs a photon of electromagnetic radiation, promoting a valence electron to an unoccupied higher-energy orbital without ionizing the atom. The resulting electron configuration of the atom in this excited state is \(1s^2 2s^2 2p^6 3s^2 3p^4 4s^1\). Which of the following identifies the neutral atom?
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