FTP, name this toxic gas with chemical formula NO.
First prepared in about 1620 by Jan Baptist van Helmont, this compound is one of the few stable compounds with an odd number of electrons. The 1998 Nobel Prize in physiology or medicine was awarded for the discovery that it is used within the body to regulate blood pressure.  Industrially it is reacted with hydrogen in the presence of a catalyst to manufacture hydroxylamine and can also reacted to lose or gain an electron to form a nitrosyl.  In the body it causes endothelial cells to relax, an effect exploited in anti-impotence drugs and the alleviation of chest pain by nitroglycerin.  FTP, name this toxic gas with chemical formula NO.
First prepared in about 1620 by Jan Baptist van Helmont, this compound is one of the few stable compounds with an odd number of electrons.
nitric oxide (accept "NO" early; "nitrous oxide" is wrong)