7. An alloy is a solid solution consisting of atoms of two or more metals. They can be created through heat and modify the properties of metals.
8. One alloy that is used commonly is brass. This is an alloy of copper and zinc and is used in plumbing, lighting fixtures, rivets, screws, and ships. Another common alloy is pewter. Pewter is a mixture of tin, copper, bismuth, and antimony and is used for figurines and other decorative objects.
9. Carbon is a nonmetal that is a component of both steel and stainless steel.
10. An example of a well-defined compound is Ni3Al, a nickel and aluminum metallic alloy. It has a low density, but is very strong and is used in jet aircraft engines.
11. Semi-conductors, since they are not completely non-conductive, but not entirely strong conductors, are placed in between metals and nonmetals. This is because metals are good conductors and nonmetals are not, so putting the semiconductors in between is logical.
12. Some elements commonly used for doping semiconductors are boron, arsenic, and phosphorous.
13. Semiconductors are used for electronic devices like transistors and integrated circuits for computers. They also allow computers to process digital information.
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