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.
So the gases are in the non-metals section. An unreactive gas would most commonly be found in group 18 (last column) on the periodic table of elements. These are the noble gases, and have 8 electrons on their outer shell, so they are very stable. Since they are stable, they are unreactive.They rarely react with other chemicals.rgon is an element with atomic number 18. It has very low melting and boiling points. Argon, is a non-metal element and noble gas.