The density of a gas is propotional to its molecular weight. Air is composed of primarily of nitrogen and oxygen, which have molecular weights of about 28 g/mol and 32 g/mol respectively. Sulfur hexafluoride has a molecular weight of about 146 g/mol, which would make it roughly 5 times denser than air.
21.95%
SCl6 . this compound is not known. The compound SF6 sulfur hexafluoride is known- it is a gas under normal conditions.
The heaviest gas at: 293.15º K is WF6, or Tungsten Hexafluoride.
Sulfur dioxide, SO2
oxygen
21.95%
That would be sulfur hexafluoride. It is a very useful gas, but it's also the most potent greenhouse gas there is.
Sulfur hexafluoride.
SF6 is sulphur-hexa-fluorine, it is used in gaseous form as an arc suppressent and also to insulated EHV busducts and switchgear.
The chemical formula of uranium hexafluoride is UF6.
Examples: tritium, sulfur tetrafluoride, tellurium hexafluoride, etc.
SCl6 . this compound is not known. The compound SF6 sulfur hexafluoride is known- it is a gas under normal conditions.
The heaviest gas at: 293.15º K is WF6, or Tungsten Hexafluoride.
It's a very powerful greenhouse gas, but it's nontoxic and is used in a few medical applications.
Is natural gas heavier than air
There are other gasses that are heavier (denser). The MOST dense gas is a rare highly corrosive gas known as tungsten hexafluoride. A more common gas, Radon, is about 5 times heavier than CO2. It is radioactive, though.
Sulfur dioxide, SO2