7. An alloy is a solid solution consisting of atoms of two or more metals.
8. Two common alloys are brass and steel. Brass is made from copper and zinc. We use brass in plumbing, screws, and lighting fixtures. Steel is made from iron and carbon. Steel is used in car and plane parts, kitchen utensils, kitchen appliances, and commonly in modern house architecture.
9. Carbon is used in stainless steel and in steel.
10. AlMg- magnalium (magnesium and aluminum). It is strong and used in airplane bodies and ladders.
11. Semiconductors are between the metals and nonmetals on the periodic table.
12. Boron, arsenic, and phosphorous are commonly used for doping semiconductors.
13. They are commonly used in electronic devices such as transistors and integrated circuits for computers.
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