Fluorinated gases has the longest atmospheric lifetime.
In a gas, the particles are spread apart. They resemble a "ideal gas," where there is little particle interaction and collisions are completely elastic, under normal pressure and low temperatures. Intermolecular interactions between gas particles have a bigger influence on the properties at higher pressures. Most gases are transparent because of the gap between atoms or molecules. Like fluorine and chlorine, some of them are barely colored. Gases often respond to electric and gravitational fields less strongly than other states of matter. Gases have a lower density and lower viscosity than liquids and solids.
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