ASSESSMENT Standardized Test Prep
Select the choice that best answers each question or 7. How many valence electrons does arsenic have? completes each statement. (A) 5 (C) 3 (B) 4 (D) 2 STP Answers Tips for Success 8. Which electron configuration represents a nitride 1. c ReviewR iAllthA All the Answer Choices Even if you find an ion? answer that looks correct, continue reading until you 2. d (A) 1s2 2s2 3s2 4s2 (C) 1s2 2s2 2p3 have looked at every answer. There may be more s2 s2 p6 s2 3. (E) than one correct response, or one may be better than (B) 1 2 2 (D) 1 another. Also, “all of the above” may be a possible 9. When a bromine atom gains an electron 4. (B) answer. If you stop reading as soon as you find an (A) a bromide ion is formed. 5. (D) answer that is correct, you won’t notice this option. (B) the ion formed has a 1Ź charge. (C) the ion formed is an anion. 6. (C) (D) all the above are correct. 1. Which of these is not an ionic compound? 7. a (A) KF (C) Na2SO4 Use the description and the graph to answer 8. c (B) SiO (D) Na O 2 2 Questions 10–12. 9. d 2. Which statements are correct when barium and Lattice energy is the energy required to change one 10. Because the atomic radius increases moving oxygen react to form an ionic compound? mole (6.02 ñ1023 formula units) of a crystalline, ionic down the halogen group, the lattice energy I. Each barium atom loses 2 electrons and solid to gaseous ions. The graph below shows the lat- forms a cation. tice energies for ionic compounds formed between decreases. II. Oxygen atoms form oxide anions (O2Ź). selected alkali metals and halogens. 11. Lattice energy decreases as the atomic radius of III. The ions are present in a one-to-one ratio Lattice Energies for Selected the alkali metal increases. in the compound. Ionic Compounds 12. decreases (A) I and II only 1100
(B) II and III only ) Li (C) I and III only 1000 mol
(D) / Na I, II, and III 900 kJ ( K The lettered choices below refer to Questions 3 –6. 800 Rb A lettered choice may be used once, more than once, Cs or not at all. 700 (A) gains two electrons 600 (B) loses two electrons Lattice energy 500 (C) gains three electrons F Cl Br I (D) loses one electron (E) gains one electron 10. For a given alkali metal, what is the trend in lat- tice energy as the atomic radius of the halogen Which choice describes what likely happens as each increases? of the following elements forms an ion? 11. For a given halogen, what is the trend in lattice 3. iodine energy as the atomic radius of the alkali metal 4. magnesium increases? 5. cesium 12. Complete this sentence: “As the atomic radius of 6. phosphorus either the halogen or the alkali metal increases, the lattice energy .”
If You Have Trouble With . . . Question 123456789101112 See Lesson 7. 2 7. 2 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7. 2 7. 2 7. 2
Ionic and Metallic Bonding 219
Ionic and Metallic Bonding 219