(1) d.
30. Match each term in column A with its definition in column B.
A
B
(2) a.
_____ (1) Ionic bonding.
a. Occurs when atoms share electrons
(3) b.
in order to achieve chemical
_____ (2) Covalent bonding.
stability.
_____ (3) Metallic bonding.
b. Occurs when one atom gives up an
electron that is used by another
atom to achieve chemical stability.
c. the continual exchange of valence
electrons between several atoms.
(1) b.
31. Almost all semiconductor materials possess a NEGATIVE temperature
(2) a.
coefficient of resistance, which means that the resistance DECREASES as
(3) c.
the temperature increases. There are two ways in which an increase in
temperature can affect the interaction of the electrons of a solid within an
external electric field. Specifically, temperature can change the total number
of electrons available for conduction, and it can change the average speed of
motion of the electrons in the electric field. Semiconductors are elements
possessing four valence electrons (see germanium on the periodic chart).
Such elements give up more of the valence electrons for conduction when
they undergo an increase in
IT0341
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