what is easier to ionize
Ionization, in chemistry and physics, any process by which electrically neutral atoms or molecules are converted to electrically charged atoms or molecules (ions). Ionization is one of the principal ways that radiation, such as charged particles and X rays, transfers its energy to matter. 1  In chemistry, ionization often occurs in a liquid solution. 2  Ionization by collision occurs in gases at low pressures when an electric current is passed through them.