Tantalum
Tantalum is a rare metal with the symbol Ta and atomic number 73. It is typically found in the ore columbite-tantalite (coltan) and is a solid at room temperature.
Lithium
Lithium is a soft, silvery-white metal that is highly reactive and flammable. It is a chemical element with the symbol Li and atomic number 3.
Lead (Pb)
Lead is a naturally occurring toxic metal found in Earth’s crust. It is poor conductor of heat and do not react with water.