Hydrogen gas
Hydrogen gas, because molecules these are the lightest and smallest of all gasses
Hydrogen is not only the lightest element of all, it is also very reactive.
The lightest element of all should have the lightest atomic mass. It is hydrogen-1 isotope. This atom has only one proton and no neutrons.
The lightest diatomic element is hydrogen (H2). It has a molecular weight of approximately 2 grams per mole, which is the lightest of all the elements.
Hydrogen is the lightest of all elements and is extremely flammable. It is also the most plentiful gas in the universe.
Much more dense. They are the two lightest gasses in the universe, and gasoline is a liquid, which is always denser than a gas.
Hydrogen is the lightest of all elements. According to the Periodic Table, its atomic weight is 1.00794 u, even lighter than helium.
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Lithium.
Lithium.
The opposite of lightest is heaviest.
All noble gasses contain electrons. In fact, all gasses contain electrons.