It is Hydrogen, it is the chemical element with atomic number 1. It is represented by the symbol H. With an average atomic weight of1.00794 u (1.007825 u for Hydrogen-1), hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the Universe's chemical elemental mass. Stars in the main sequence are mainly composed of hydrogen in its plasma state. Naturally occurring elemental hydrogen is relatively rare on Earth.
aren't i clever! ;)
Hydrogen was, and is, the lightest gas
The second lightest gas is helium. The lightest gas is hydrogen which is also the lightest element. They are very close on the periodic table.
Because it is the lightest element and it is a gas.
Hydrogen is the lightest known, diatomic gas with formula: H2
no, hydrogen is helium is the second lightest gas
Yes it is, and it's also the lightest gas in the universe.
gas is the lightest in weight
helium is the lightest air
generally, you can look at the Periodic Table of Elements. hydrogen is the lightest of both
the lightest gas is hydrogen
colourless ,odourless ,non-toxicgas sligtly soluble in water lightest known gas
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.
The lightest gas in the universe is probably hydrogen having atomic mass 1 u.(approx).