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.
Chlorine needs to gain (-1) one valence electron to become unreactive like Argon. The reason why Argon is unreactive is because it had 8 valence electrons.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.