<span>The first ionization
energy is the energy that is obligatory in order to eliminate the first
electron from an atom(neutral) in the GAS phase , the second ionization energy is defined as the
energy required to remove the second electron from an atom(+1 ion) in the GAS phase. </span>the third ionization energy is the energy it takes to remove an electron from a 2+ ion. (That means that the atom has already lost two electrons, you are now removing the third.) <span> Ionization energy will normally increase for every electron that is removed and
increases from left to right in the periodic table and moving up the periods hope it helps</span>
