Helium and neon are less dense than air; argon, krypton, xenon and radon are denser than air.
Gases are less dense than solids.
yes they are
Yes, there are at least two: Iodine vapor (molar mass 254) and Radon gas (222, but not natural occurring) are heavier (and so more dense) than Mercury vapor (200 g/mol).
it is available
No, the noble gasses are nonmetals that are less reactive than all other elements.
Gases are less dense than solids.
No. The gas phase is generally less dense than the liquid phase.
yes they are
Yes, there are at least two: Iodine vapor (molar mass 254) and Radon gas (222, but not natural occurring) are heavier (and so more dense) than Mercury vapor (200 g/mol).
it's not
it is available
Neon, ammonia, methane, hydrogen, helium and water vapour are the best lifting gases and are all less denser than air.
No, the noble gasses are nonmetals that are less reactive than all other elements.
Denser than gases but (most often) less dense than solids.
no
Yes. By definition, most gases are less dense than most solids. i can't think of a counter example. Plus, the gas inside a hot air balloon is superheated to make it even less dense, as heating things makes them less dense
Noble gases are lighter than air. Hence balloons filled with noble gases will float in air.