What is a possible electronic structure for an excited Cu(I) ion?
Correct Answer: D.[Ar] 3d9 4p1
The ground state for Cu is [Ar] 4s1 3d10. Transition metals always lose their valence s electrons before any d electrons, so the ground-state electron configuration for Cu+ [(I) means +1] is [Ar] 3d10. The only excited configuration for Cu+ must be [Ar] 3d9 4p1. An alternate strategy is to look at the number of electrons, as Cu+ has 28, and this helps eliminate A and C as they do not have 28 electrons.
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The Medical College Admissions Test (MCAT) is a test administered by the Association of American Medical Colleges (AAMC). The test is designed to test your knowledge in three specific sections; physical sciences such as physics and general chemistry, biological sciences and organic chemistry, and verbal reasoning.
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