Date class Name CHAPTER 7 CHAPTER ASSESSMENT Understanding Main Ideas (Part A) In the space at the left, write true if the statement is true: If the statement is false, change the italicized term to make it true. 1. The overall charge of a formula unit for a compound is never zero 2. In a crystal lattice, cach positive ion is surrounded by negative lens 3. Delocalized valence electrons are typical of lonic compounds. 4. A sulfate ion contains fewer oxygen atoms than a sulfite ion does. 5. Metals tend to be malleable and ductile and to have relatively high melting points 6. The more negative the lattice energy is, the stronger is the force of attraction between the ions of an ionic compound, 7. In naming ionic compounds, the cation is named first. 8. When a metal reacts with a nonmetal, the metal tends to gain electrons. 9. In naming a monatomic anion, the suffix -ide is used. 10. The prefix per- is used in naming the anion with the most oxygen atoms. Dircle b. ns2 c. ns’np a. none Circle the letter of the word or phrase that best completes the statement or answers the question. 11. What is the electron configuration for the noble gases other than helium? a. ns’np d. ns'np? 12. How many outermost d electrons are there in an ion that has achieved a pseudo-noble gas configuration? b. five c. eight d. ten 13. The anion that has the formula CIO is called the a. chloride ion. b. chlorate ion. c. hypochlorite ion. d. perchlorate ion. 14. Where does a subscript that indicates the number of atoms appear, relative to a chemical symbol in a formula? a. to the upper left b. to the lower left c. to the upper right d. to the lower right 15. What is the formula of calcium phosphate, which is made up of the ions Ca’ and POA?? a. Ca3PO4 b. Ca POM c. Ca3(PO4)2 d. Caz(PO4)3 16. Which of the following is an example of an interstitial alloy? a. brass b. 14-carat gold c. carbon steel d. sterling silver answer all