The element which has highest first ionization enthalpy in the periodic table is
Helium has the highest first ionization enthalpy in the periodic table because it is the smallest element with inert gas configuration.
An element has successive ionization enthalpy as 940, 2080, 3090, 4140, 7030, 7870, 16000 and 19,500 KJ/mole. To which group of the periodic table does the element belong to?