What is parent ionization energy?
It is the energy that is needed for ionization to happen. The parent ion is the ion before ionization, after it is known as the daughter ion
ionization energies (IE) have to do with things called ions. Ions are atoms which have gained or lost electrons. The ionization energy is the amount of energy it takes to detach one electron from a neutral atom. Some elements actually have several ionization energies. When this is the case, we refer to them as the "first ionization energy" or 'I', "second ionization energy" or 'I2', and so on. Notice that the energy variable follows Ii…
The first Ionization energy of Boron is 800.6 kJ mol-1 The first Ionization energy of Fluorine is 1681.0 kJ mol-1 Thus as you can see it is actually Fluorine and NOT Boron that has the higher Ionization energy. Looking at the Periodic Table, in general:- Across a row (left to right) on the periodic table ionization energy increases. Down a column, ionization energy decreases.