The industrial name for a gold-copper alloy is Rose Goldor Tumbaga.
If you also add silver to the alloy you get Electrum.
Group 14 in the periodic table of Mendeleev: copper, gold, silver.
cuprum :copper argentum:silver ferrum:iron kalium:potassium hydragyrum:mercury wolfram:tungsten plumbum:lead stannum:tin auron:gold natrium:sodium
The compound is copper (I) perchlorate Cu(ClO4) The similar compound, copper (II) perchlorate is Cu(ClO4)2
The formula may be Cu3N and name is copper nitride.
Copper oxide
"heat treatable aluminum alloy". There are usually other elements added as well, for various properties.
iron-group 8 copper silver and gold-group 11
coal and copper and gold
gold, sivler, and copper
Group 14 in the periodic table of Mendeleev: copper, gold, silver.
Copper, gold, silver, to name only three.
Leaving aside superconductors: graphene, silver, copper.
I think the only metals which are not white are gold and copper. And definitely, gold is that yellow metal.
(diamonds, gold, copper, oil).
Meddlemeddle spoongold/silver
Transitional elements/metals.
iron,aluminum,zinc,copper,lead,tin,gold,silver,platinum,uranium......