Medical Definition of PNEUMOTAXIC CENTER. : a neural center in the upper part of the pons that provides inhibitory impulses on inspiration and thereby prevents overdistension of the lungs and helps to maintain alternately recurrent inspiration and expiration. a neural center in the upper part of the pons that provides inhibitory impulses on inspiration and thereby prevents overdistension of the lungs and helps to maintain alternately recurrent inspiration and expiration.
Because of their uber-high stability, the noble gases are relatively unreactive. They have very high ionization energies and negligible electronegativities because they have no desire to gain or lose an electron.
Neon because it's a noble gas. Noble gases have 8 valence electron which means they have the exact amount of valance electrons to be perfectly stable. Neon. Its in the 8th group and has a full valence shell. All elements in the Noble gases are highly unreactive because they already have a full shell.