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Argon is a noble gas because it has a complete octet (8 electrons in its valence / outermost shell). So, it cannot react with any element, not even with itself, to form new compounds.
they mix with crap
Copper can form alloys with many metals: Zn, Co, Sn, Au, Ag, Ni, Be, Si, Mn, Fe, Pb, etc.
a chemical or nuclear reaction. Like mixing Hydrogen and Oxygen makes water or in a more sciency name H2O.