Discovery: Daniel Rutherford (1772) Named by: Jean-Antoine Chaptal (1790)

Discovery: Carl Wilhelm Scheele (1772) Named by: Antoine Lavoisier (1777)

Discovery: Lord Rayleigh and William Ramsay (1894)

First isolation: Lord Rayleigh and William Ramsay (1894)

We Breathe out Carbon Dioxide. As part of the carbon cycle, plants,

algae, and cyanobacteria use light energy to photosynthesize carbohydrate from carbon dioxide and water, with oxygen produced as a waste product.

Prediction: William Ramsay (1897) Discovery: William Ramsay & Morris Travers

(1898) First isolation: William Ramsay & Morris

Travers (1898)

Discovery Pierre Janssen, Norman Lockyer (1868)

First isolation William Ramsay, Per Teodor Cleve, Abraham Langlet (1895)

Methane is not toxic; however, it is extremely flammable and may form explosive mixtures with air.

Methane gas explosions are responsible for many deadly mining disasters methane gas explosion was the cause of the Upper Big Branch coal mine disaster in West Virginia on April 5, 2010, killing 25.

Discovery: William Ramsay and Morris Travers (1898)

First isolation: William Ramsay and Morris Travers (1898)

Nitrogen oxide can refer to a binary compound of oxygen and nitrogen, or a mixture of such compounds:

Nitric oxide, also known as nitrogen monoxide, (NO), nitrogen(II) oxide

Nitrogen dioxide (NO2), nitrogen(IV) oxide

Nitrous oxide (N2O), nitrogen(-I,III) oxide

Nitrosylazide (N4O), nitrogen(-I,0,I,II) oxide

Nitrate radical (NO3), nitrogen(VI) oxide

Discovery: Henry Cavendish (1766) Named by: Antoine Lavoisier (1783)

Discovery: William Ramsay and Morris Travers (1898)

First isolation: William Ramsay and Morris Travers (1898)

Ozone was proposed as a new substance in air in 1840, and named, even before its chemical nature was known, after the Greek verb ozein (ὄζειν, "to smell"), from the peculiar odor after lightning storms. Ozone's odor is sharp, reminiscent of chlorine, and detectable by many people at concentrations of as little as 10 parts per billion in air.

Sarin

http://en.wikipedia.org/wiki/Sarin_gas_attack_on_the_Tokyo_subway