All Chapters Video 2.7 Quiz Video Solution (2.4 – 2.7) Chapter OutlineChapter Quiz Question? Ask Dr. Mike! Lesson Summary 1. Which of the following electron configurations represents an element in an excited state? A. 1s22s22p5 B. 1s22s22p63s23p64s23d8 C. 1s22s22p63s23p64s13d5 D. 1s22s22p63s23p64s23d5 E. 1s22s22p63s23p24s1 2. How many unpaired electrons are present in the +2 cobalt ion, Co2+, in its ground state? A. 2 B. 3 C. 4 D. 5 E. 6 3. Please indicate which element corresponds to each of the following electron configurations. How many unpaired electrons does each one have? A. 1s22s22p6 B. 1s22s22p5 C. [Kr]5s14d5 D. [Ar]4s23d104p4 4. Why is each of the following electron configurations incorrect for atoms in their ground states? How could you correct each of these? A. 1s22s23s2 B. [Ar]3s23p3 C. [Ar]4s24d3 5. Please write the electron configuration of each of the following elements: A. Oxygen B. Potassium C. Arsenic D. Manganese E. Copper 6. Please write the condensed electron configuration of each of the following elements: A. Fr B. Br C. Ca D. Zn E. Ce F. Se Lesson 2.7 Quiz Video Solution (2.4 – 2.7) 2.1 Atomic Structure and the Bohr Model 2.1 Quiz Video Solution 2.2 Atomic Orbitals 2.3 Quantum Numbers 2.3 Quiz Video Solution 2.4 Electron Configuration 2.5 Condensed Electron Configuration, Valence, and Energy Diagrams 2.6 Electron Configuration Exceptions (Cr and Cu) 2.7 Excited Electron Configurations 2.7 Quiz Video Solution (2.4 - 2.7) 2.8 Paramagnetic vs. Diamagnetic 2.8 Quiz Video Solution 2.9 Emission Spectra, Heisenberg Uncertainty, Photoelectric Effect 2.9 Quiz Video Solution Instructor Dr. Mike Christiansen Dr. Christiansen is a chemistry professor at Utah State University and has a PhD in organic chemistry. He's been teaching students chemistry for nearly 12 years.