Chapter 17 Review Answers
20. Metals
21. Allotropes
22. Metallic bonding
23. Diatomic molecules
24. Transition elements
25. B
26. A
27. D
28. A
29. C
30. C
31. C
32. D
33.
a. metals
b & c transition elements, inner transition elements
d & e hydrogen, noble gases
34.
a. alkali
b & c Cs, Na
d. inner transition
e. actinides
f & g Hg, Fe
35. Lanthanides; europium, cerium, terbium
Actinides; californium, nobelium uranium
36. Mercury might poison the person using the thermometer if it broke or leaked.
37. Hydrogen is flammable and, thus, dangerous. Helium is inert and nonflammable, so it is safer to use
than hydrogen.
38. Nonmetals; they do not conduct electricity and are less malleable and ductile.
39. Silver compounds change chemically when they are exposed to light, and they leave an image on
the paper.
40. All vitamin and pill bottles should have overdose warnings. They should clearly state that taking
more than the recommended dosage could be harmful.
41. Aluminum is a metal because it is malleable, ductile, conductive, and shiny, and it can form ionic
bonds with nonmetals. Also, a piece of aluminum contains metallic bonds – outer-level electrons are
loosely held and shared between the Al atoms. Carbon is a nonmetal because it is not malleable,
ductile, or shiny and because it is a poor conductor. It cannot form metallic bonds, but it can bond
covalently with itself and other nonmetals.
42. Metallic bonding is a bond in which the outer-level electrons are loosely held and shared between all
the atoms of the substance. This bond is why metals have the ability to conduct heat and electricity.
43. In a diamond, each carbon atom is bonded to four other carbon atoms at the corner points of a
tetrahedron. Graphite consists of hexagonal layers of carbon atoms. The layers are weakly bonded to
each other. The buckyball allotrope is a soccer-ball shaped molecule.