So why do so many life-forms breathe oxygen? There are probably thousands of kinds of metabolisms, or chemical processes that maintain life, said Donald Canfield, a geobiologist at the University of ...

widely distributed element and a member of the halogen family,” according to the National Library of Medicine. “Fluorine gas reacts with most organic and inorganic substances; with metals ...

“One can indeed make various hypotheses on the nature of the liberated gas, the simplest would be that we are in the presence of fluorine”. Moissan was to be awarded the Nobel Prize in ...

producing an alkaline solution and hydrogen gas. The metals become more reactive as you go down the group. The elements in group 7 are known as halogens. Fluorine and chlorine are gases.

But it's actually a very reactive element. Anyone who's burned ... That's not a gas you'd want to breathe. Chlorine and fluorine are also poisonous, which highlights another benefit of oxygen.

producing an alkaline solution and hydrogen gas. The metals become more reactive as you go down the group. The elements in group 7 are known as halogens. Fluorine and chlorine are gases.