Ch8questions - 1331 CHAPTER 8 REVIEW QUESTIONS Electron Configurations 1(A 2 The element in Period 5 Group 3A has the outer electron configuration

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1 1331 CHAPTER 8 REVIEW QUESTIONS Electron Configurations 1. The element in Period 5, Group 3A, has the outer electron configuration (A) 5 s 2 5 p 1 (B) 3 s 2 3 p 5 (C) 3 s 2 3 p 3 (D) 5 s 2 5 p 3 2. An atom has a valence shell electron configuration of ns 1 . To which group of metals in the periodic table does it belong? (A) transition (B) alkaline earth (C) rare earths (D) alkali 3. Which electron configuration is impossible ? (A) 1 s 2 2 s 2 2 p 6 3 s 2 (B) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 (C) 1 s 2 2 s 2 2 p 6 2 d 2 (D) 1 s 2 2 s 2 2 p 5 3 s 1 4. Which electronic configuration represents an excited state? (A) [He]2 s 2 2 p 2 (B) [Ar]4 s 2 (C) [Ne]3 s 2 3 p 5 (D) [Ne]3 s 1 3 p 1 5. The ground state electron distribution for the Sn 2+ ion is (A) [Kr]4 d 10 5 s 2 . (B) [Kr]4 d 10 5 s 1 5 p 1 . (C) [Kr]4 d 10 5 p 2 . (D) [Kr]4 d 10 5 s 2 5 p 2 . 6. A bismuth atom has one more electron than a lead atom. Into which energy sub–level does this added electron go? (A) 5 p (B) 6 p (C) 6 s (D) 7 s 7. The ground–state electronic configuration of the Cr atom is (A) [Ar]4 s 1 4 d 5 (B) [Ar]3 d 6 (C) [Ar]4 s 2 4 p 4 (D) [Ar]4 s 1 3 d 5 (E) [Ar]4 s 2 3 d 4 8. The number of unpaired electrons in the ground state of Mn 0 is (A) one (B) three (C) five (D) seven 9. The ground state valence shell electron configuration of a neutral atom of atomic number 25 is (A) 4 s 2 4 p 5 (B) 3 d 5 (C) 4 s 2 3 d 5 (D) 5 s 2 4 d 5 10. How many unpaired electrons are there in the Mn 2+ ion? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5 11. The number of unpaired electrons in a gaseous selenium atom is (A) 2 (B) 3 (C) 4 (D) 6
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2 12. Which one of these has an electronic configuration different from the others? (A) Ar (B) Mg 2+ (C) K + (D) S 2– 13. The electron configuration of the two outer subshells of vanadium, element number 23, is (A) 4 s 3 3 d 2 (B) 4 s 2 4 p 3 (C) 4 s 2 3 d 3 (D) 4 s 1 3 d 4 14. Which of the following ions is paramagnetic? (A) Fe 3+ (B) Na + (C) Cu + (D) Ag + (E) Cd 2+ 15. Cd forms the ion Cd 2+ , whereas Ag gives the Ag + ion. What is an explanation of these facts? (A)
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This homework help was uploaded on 04/15/2008 for the course CHEM 1331 taught by Professor Bott during the Fall '08 term at University of Houston.

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Ch8questions - 1331 CHAPTER 8 REVIEW QUESTIONS Electron Configurations 1(A 2 The element in Period 5 Group 3A has the outer electron configuration

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