7. An alloy is a solid combination of atoms of two or more metals.
8. White gold and stainless steel
9. Iron and Carbon
10. Red brass
Formula: Cu + Zn
Use: Brass is used in plumbing and lighting fixtures, rivets, ships, and screws.
Property: Vary within the proportion of copper and zinc used and with the addition of small amounts of other elements.
11. The metalloid silicon belongs in a class of materials called semi-conductors. Metals are good conductors of electricity whereas nonmetals are not. Semiconductors, on the periodic table, lie in between the two groups (metals and nonmetals). Some include Germanium and Silicon.
12. Phosphorus, Aluminum and Arsenic
13. A balanced amount of electricity.
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