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Gold is almost two times heavier than silver. In metallurgy generally a heavy metal may be defined on the basis of density. The density more precisely, mass density of a substance is its mass per unit volume.
Gold is the heavier metal than silver. Osmium is the heavier metal than all the metals.
Gold has many more protons and neutrons in the nucleus of each atom than iron does. So each gold atom weighs almost four times as much as each iron atom. ... So there are nearly as many gold atoms as iron atoms per volume, but each gold atom weighs a lot more. So gold ends up denser.