Lead floats in mercury.
Lead would float in mercury, as it is slightly less dense. (11.3 g/cc for lead, 13.5 g/cc for mercury)
Yes, as the lead is less dense than the mercury.
Most materials will float in Mercury because it is so dense. A lump of Lead will float in a bath of Mercury. The well-known metals Gold, Platinum, Tungsten, Uranium and Plutonium are more dense than mercury and would sink. More specifically, any material having a density less than 13593 Kg/m3 will float in a bath of Mercury.
With a density of 13.5 g/cm3, mercury is the only liquid (at least at room temperature) denser than lead which has a density of 11.3 g/cm3.
No, the density of water ice (0.92) is far below that of mercury (13.6) and so the ice will float on liquid mercury. Even iron density 7.85) and copper (8.73) and lead (11.3) will float on mercury but gold (density 19.6) sinks!
A hydrometer consists of a cylindrical stem and a bulb weighted with mercury or lead shot to make it float upright. Mercury has a higher density, thus a lower volume for the same weight than lead. It is a toxic liquid metal, but also more dangerous and difficult to clear up the mess when a glass hydrometer is broken
Strictly be density, nickel should float on mercury.
Solid iron will float in liquid mercury. In most liquids it will sink.
No, they are not bouyant. They won't float on water, but they will float on mercury.
That depends on what is it made of, however even lead cannon ball would float in mercury, let alone steel one. If you compare densities, you can see that mercury is more dense than lead in room temperature (13530 kg m-3 vs 11 540 kg m-3). One can imagine a cannon ball made of depleted uranium perhaps, which would sink in mercury, being more dense.
Oil is denser than cork, so the cork would float.