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
b. ns2
c. ns?np
d. nsnp
12. How many outermost d electrons are there in an ion that has achieved a pseudo-noble gas
configuration?
a. none
b. five
c. eight
d. ten
13. The anion that has the formula C10 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 Ca2+ and PO 3-?
a. Ca, PO4
b. Ca PO
c. Caz(PO2)2 d. Ca,(PO.)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