7. An alloy
is a solid combination of atoms of two or more metals.
8. Two alloys we use regularly
are steel and gold. Steel is composed of iron and carbon, and it us used to
make kitchen utensils, plumbing fixtures, and architectural designs. 14-carat
gold is made of gold, copper, and silver, and is used to make jewelry.
9. Carbon is
a nonmetal component of both steel and stainless steel.
10. Chromium-platinum (Cr3Pt) is
an alloy that is also a well-defined compound. It composes some razor blade
edges and is very hard.
11. Elements that behave as semiconductors are metalloids. This characteristic is logical,
for metals are known to be conductive, and nonmetals are not.
12. Three
elements commonly used for doping semiconductors include phosphorus (P),
arsenic (Ar), and aluminum (Al).
13. The
primary use of the products of semiconductor technology is for computers to
process digital information. Semiconductor devices include transistors and
integrated circuits, which are parts of electronics.
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