Gold has a density of about 19.320 g/cc
Lead has a density of about 11.34 g/cc and would be a poor substitute
Tungsten has a density of about 19.6 g/cc and is close.
Plutonium has a density of about 19.816 g/cc and is close, a little heavy, but the radioactivity may be a problem.
Uranium has a density of about 18.9 g/cc and is also close, but also radioactive.
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The mets with densities closest to gold are:18.95 Neptunium(Np)19.32 Gold(Au)19.35 Tungsten(W)
The density of the shiny, gold-colored bar of metal is 12.19 grams over cubic centimeters. The density of a Gold(Au) is 19.3 grams over cubic centimeters. These means that the gold-colored bar of metal is not pure gold.
1 kg of platinum has a greater density than 3 kg of gold. Platinum has a density of approximately 21.45 g/cm3, while gold has a density of about 19.32 g/cm3. This means that platinum is denser than gold.
You could compare the measured density of the bar of metal to the known density of pure gold (19.32 g/cm³). If the measured density matches the density of pure gold, there is a high likelihood that the bar is made of pure gold. If the measured density is significantly different, then the bar is likely not pure gold.
The density of gold is approximately 19,320 kilograms per cubic meter. This high density is one of the reasons why gold is valued in various industries.