Copper is an element whose symbol is Cu. Copper is used in wiring and cables to help conduct electricity and power things such as heaters, microwaves, and ovens. Copper is also used in architecture, in fact, the Statue of Liberty is made out of copper. This is because it is extremely durable and weather proof.
Uses on another planet!
Copper is a very useful element because it has so many uses. It can be used to make copper tools such as shovels, and utensils such as knives and forks. It can also be used to make weapons and protection like arrows for a bow. Copper can be used to trade and barter with any enemy aliens that might inhabit the planet. Par say copper for your life. Copper can also be used in architecture such as roofing, shingles, and other neat stuff. Finally copper is a good conductor for electricity.
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There are some good explanations to how I evaluated my element. I chose zero stars on biological need because we really do not need it to survive. There are three stars in social need because it is a shiny and trad-able with locals, but not anywhere near valuable or interesting as gold or oxygen. There are 3 stars functional need because there are so many cool things you can make with copper, but copper is not a very long lasting material. Still, many power sources are made from copper wiring and cables. Finally there are three stars in defensive needs because even though you can make metal tools and weapons out of copper, they would still be very weak and fragile.