It isn't, gold(Au) , silver(Ag) and copper(Cu) are all separate elements.
But if you're talking about when they add copper or silver to gold, it's to harden it, so you can't bend it in your hands.
Some metals that are not silver gray in color include gold (yellow), copper (orange-red), brass (yellow-brown), and bronze (reddish-brown).
Out of copper, silver, and gold, silver has the highest conductivity.
Not a meaningful question. Gold coins were made from gold and copper without any silver in them. Silver coins were made from silver and copper without any gold.
Copper
Gold, Silver and Copper belong to the native elements mineral group.
Gold
Silver is harder than gold but softer than copper.
Gold follows copper and silver in order, in the same vertical column in the periodic table of the elements.
The most conductive metals are silver, copper, and gold. Silver is the most conductive metal, followed by copper and then gold. Silver has the highest electrical conductivity, followed by copper, and then gold.
Jewelry can be made from iron, silver, copper, and gold. It is melted down and formed into lovely pieces.
Copper, Silver and Gold
gold,copper and silver.