<Ul> <Li> Precious metal--Variously - defined group of non-radioactive metals of high economical value . </Li> <Li> Coinage metals--Various metals used to mint coins, primarily the group 11 elements Cu, Ag, and Au . </Li> <Li> Platinum group--Ru, Rh, Pd, Os, Ir, Pt . </Li> <Li> Noble metal--Variously - defined group of metals that are generally resistant to corrosion . Usually includes Ag, Au, and the platinum - group metals . </Li> <Li> Heavy metals--Variously - defined group of metals, on the base of their density, atomic number, or toxicity . </Li> <Li> Native metals--Metals that occur pure in nature, including the noble metals and others such as Sn and Pb . </Li> <Li> Earth metal--Old historic term, usually referred to the metals of groups 3 and 13, although sometimes others such as beryllium and chromium are included as well . </Li> <Li> Transuranium elements--Elements with atomic number greater than 92 . </Li> <Li> Transactinide elements--Elements after the actinides (atomic number greater than 103). </Li> <Li> Transplutonium elements--Elements with atomic number greater than 94 . </Li> <Li> Minor actinides--Actinides found in significant quantities in nuclear fuel, other than U and Pu: Np, Am, Cm . </Li> <Li> Heavy atom--term used in computational chemistry to refer to any element other than hydrogen and helium . </Li> </Ul> <Li> Precious metal--Variously - defined group of non-radioactive metals of high economical value . </Li> <Li> Coinage metals--Various metals used to mint coins, primarily the group 11 elements Cu, Ag, and Au . </Li> <Li> Platinum group--Ru, Rh, Pd, Os, Ir, Pt . </Li>

He be ne xe find odd man out