Lithium and sodium will both float on water, but not for long, because they're both explosively reactive with water.
an electron.
It only floats if the density of the metal used is less than 1 gm/cm3
by making a boat that floats! XD
Usually aluminum floats because it is also quite light.
A metal boat would float on water and be a conductor of electricity.
It floats because the shape of the hull with a large cavity inside displacing the water counteracts the weight of the metal hull. The water displacement counteracts the force of gravity, spreading the weight of the boat out across a larger surface area with a great tensile strength, resisting the force of gravity.
Lithium is the metal. It isn't used for mental medication, but its compounds are. People often call the medicine lithium, but it's not chemically correct.
The molten metal is the denser material, the slag floats on top of it and can be "scooped" off during the smelting process.
A pencil floats, a human no float, a feather floats, paper floats, ice floats, keys do not float, rocks do not float, coins do not, flip flops float. Second answer: I think you meant to ask, 'What floats and then some time later starts to sink. If that is what you meant, the answer is: There are absorbent substances which float when dry, then after absorbing water while they are floating, they increase in density and then sink.
There is no specific collective noun for a group of floats, in which case, general collective nouns are used according to the situation, such as an armload of floats, a bin of floats, a case of floats; or, you could be creative; a flight of floats, a flotilla of floats, a flurry of floats.
Floats
You don't. Each character does something different when they eat a power flower. Yoshi spits fire, Mario floats, Luigi turns invisible, and Wario turns into metal.