Solution: The electron configurations described in this
Chapter 7, Problem 7.12c(choose chapter or problem)
The electron configurations described in this chapter all refer to gaseous atoms in their ground states. An atom may absorb a quantum of energy and promote one of its electrons to a higher-energy orbital. When this happens, we say that the atom is in an excited state. The electron configurations of some excited atoms are given. Identify these atoms and write their ground-state configurations: (a) 1s 1 2s 1 (b) 1s 2 2s 2 2p2 3d1 (c) 1s 2 2s 2 2p6 4s 1 (d) [Ar]4s 1 3d104p4 (e) [Ne]3s 2 3p4 3d1
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