7. An alloy is a solid combination of atoms of two or more metals.
8. Brass and 14-carat gold.
9. Both iron and carbon.
10. Brass, which is a combination of Copper and Zinc: Zn + Cu--->ZnCu
11. They are in family or group 114 and 15.
12. Phosphorus, arsenic, and aluminum.
13. Semi-conductors are mostly used in technology devices such as transistors and intergrated circuits within computers and various electronics.
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