7-4 Comparing Metals and Nonmetals

ductility is the ability to be drawn into ___

wires

malleability is the ability to be ____

hammered or pressed

metals are good ____ and ____ conductors

thermal, electric

in a face centered cubic structure, every atom has ___ neighbors

12

in a body centered cubic structure, every atom has ___ neighbors

8

in a face centered cubic structure, every atom has ___ neighbors

12

what kind of metals are the most brittle?

hexagonal close-packed

the more ___ packed the planes in a metal crystal are, the more _____ it is

closely, ductile

list (BCC, HCP, FCC) in terms of lowest to highest Young’s Modulos

FCC, BCC, HCP

a higher ductile material has a _____ Young’s modulos

lower

a low ductile material has a _____ Young’s modulos

higher

list the three types of point defects

interstitial, substitution, and vacancy

in an interstitial defect…

extra atoms are inserted

in a substitution effect…

different atoms replace the existing atoms

in a vacancy effect…

atoms are missing

all gemstones contain defects of …

aluminum oxide

aluminum oxide is ____

clear and colorless

what makes blue sapphires?

substitutions of titanium and iron atoms

green sapphires result from…

iron impurities

red rubies are formed by…

chromium atom substitutions

folding and hammering creates…

shear forces

shear forces causes…

dislocations

dislocations cause the metal to…

harden

why does hammering metal make metal harder?

it increases dislocations

steel is a combination of iron and up to ___ by weight of ____

2%, carbon