n2


From The Collaborative International Dictionary of English v.0.48:

Nitrogen \Ni`tro*gen\ (n[imac]"tr[-o]*j[e^]n), n. [L. nitrum
   natron + -gen: cf. F. nitrog[`e]ne. See Niter.] (Chem.)
   A colorless nonmetallic element of atomic number 7, tasteless
   and odorless, comprising four fifths of the atmosphere by
   volume in the form of molecular nitrogen (N2). It is
   chemically very inert in the free state, and as such is
   incapable of supporting life (hence the name azote still
   used by French chemists); but it forms many important
   compounds, such as ammonia, nitric acid, the cyanides, etc,
   and is a constituent of all organized living tissues, animal
   or vegetable. Symbol N. Atomic weight 14.007. It was formerly
   regarded as a permanent noncondensible gas, but was liquefied
   in 1877 by Cailletet of Paris, and Pictet of Geneva, and
   boils at -195.8 [deg] C at atmospheric pressure. Liquid
   nitrogen is used as a refrigerant to store delicate
   materials, such as bacteria, cells, and other biological
   materials.
   [1913 Webster +PJC]
.

From The Collaborative International Dictionary of English v.0.48:

Chromophore \Chro"mo*phore\, n. [Gr. ? color + fe`rein to bear.]
   (Chem.)
   Any chemical group or residue (as NO2; N2; or O2) which
   imparts some decided color to the compound of which it is an
   ingredient.
   [1913 Webster]
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