2SDS 7-13 p.204

7. An alloy is a solid combination of atoms of two or more metals. Alloys also include some well-defined compounds. 

8. Two alloys I use regularly are steel and 14-carat gold. 

9. Carbon (C) is a component of both steel, and stainless steel. 

10. Chromium-platinum alloy: 
Formula: Cr3Pt
Use: basis of some commercial razor blade edges. 
Physical property: very hard

11. Elements that behave as semiconductors are located on the break between metals and nonmetals--metalloids.

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 the allowance for computers to process digital information.