All objects float if their average density is less than the substance that they are immersed in. So if something is hollow, or has a substance lighter than the liquid in it, it would float on the liquid. (Some things are denser than their surroundings, some are less dense)
That depends what it's made of ! A metal one will sink, but a wooden or plastic one will float.
Plutonium is a dense metal and will sink in water due to its high density.
Gold is a very dense metal, so it would sink in water rather than float.
cesium will sink
Mercury is a heavy metal, it will sink in sea water.
Whether a pen floats or sinks in water depends on its material. A plastic pen will typically float, while a metal pen will likely sink. The density of the material determines whether an object will float or sink in water.
Cesium metal will float on water as its density is lower than that of water, causing it to float.
Rubidium is a metal, so it is denser than water and will sink when placed in it.
it will float, with it being a soft metal, try it for yourself
Blocks made of materials like wood or plastic would typically float in water, while blocks made of materials like metal or concrete would sink. The density and composition of the block determine whether it will sink or float in water.
The bread floats the meal might sink depending on what ingredients are used.
Tantalum is a dense metal (density around 16.6 g/cm³), so it will sink in water.