helium is the lightest air
Helium
helium
Helium
Yes, it is.
Hydrogen gas is the lightest. With a formula of H2, it has an atomic mass of only half that of helium. It is highly reactive and there isn't much of it just floating around by itself. Plus, because it is so light, it just floats right up out of our atmosphere and into space.
Hydrogen was, and is, the lightest gas
Helium
helium
Yes, it is.
Helium
The lightest element would be helium
Not only that, but it's one of lightest, or possibly the lightest, gas in the world. I'm a nerd, so you can trust me.
Hydrogen gas is the lightest. With a formula of H2, it has an atomic mass of only half that of helium. It is highly reactive and there isn't much of it just floating around by itself. Plus, because it is so light, it just floats right up out of our atmosphere and into space.
helium
Helium
Technically Helium is classed as a Noble gas and has a MW of 4g/mol.
Helium but it is noble gas. Lithium is the lightest solid element that found in natural form.