Halomethane compounds are molecules of methane (CH4) with one or more of the hydrogen atoms replaced with halogen atoms. The halogens are found in group 17 of the periodic table of the elements. Forming covalent bonds, these compounds are generally stable. Environmental aspects While these are all considered to be human-made compounds, they may appear inadvertently via natural processes in the environment through the introduction of other non-natural industrial materials. An example's the creati… (More on Halomethane)