An element that you really need.
Gold, it buys anything.
Gold is a metal that is one of the most valuable in the world. No wonder it can buy anything.
Gold is the most malleable of all metals and could be flattened into an infrared heat shield for heat-resistant suits. This is important if you don't want your face burned off. Gold is also one of the most expensive objects in the world and it could be used to barter for many of the elements, possibly even oxygen and phosphorus. Gold has many uses including-
Coins(social and functional need)
Cell phones/GPS(functional need)
If you look above, you can see gold is very important as it can be turned into knifes, guns, and bullets to protect yourself. It can be used as shelter, and turned into houses and shacks. It is also a MAJOR social need because it can be traded for other elements.
If you have enough gold, you could have lots and lots and lots of money. This could make you the richest person in your area, and help you earn even more elements than you already have!