Perhaps an alloy of Osmium and Iridium, the two densest metals known. however I suspect an alloy of Iridium with an interstitial dopant in solid solution (perhaps a small element which could fit between the iridium atoms) might be more dense. Osmium is quite toxic when oxidised so I wouldn't bother with it.
metal
Bronze is an alloy that is not metal plated. It is composed of copper and tin.
Brass is a metal alloy made of copper and zinc.
an alloy
An alloy
Osmium is the densest metal, you can use google for figuring out the rest.
osmium
Iridium
Osmium with a density of 22.6 g/cm cubed
That metal, if it is a pure elemental metal. Each element that makes up the alloy, if it is a metal alloy.
alloy
Iron is not an alloy - it's a metal element. An alloy is a mixture of two or more elements.
An alloy?
metal
Bronze is an alloy that is not metal plated. It is composed of copper and tin.
Siver Halides are neither a metal or an alloy. They are a salt.
copper is NOT an alloy, it is an elemental metal