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Iron
The oxide coating is quickly formed again.
This element is used for that process, and for the preparation of those compounds.
Element: He Helium.
what element is used to build missiles
Coins, jewelry and electronic connections. Gold is the best electrical conductor and does not tarnish.
gold
CU noob
The element silver is used for Jewelry, silverware, etc. It has also been used in many coins around the world.
Ni
Silver is one example.
hydrogen
Zinc copper nickel swag
Nickel, Zinc, Copper, Iron
Iron
You are most likely referring to silver which will tarnish with time and often turns black (although depending on the composition of the gas its exposed to it can turn any colour of the rainbow)
tarnish