Question

What is the exact meaning of ionization energy?

Answer 1

Answer:

Ionization energy is the quantity of energy that an isolated, gaseous atom in the ground electronic state must absorb to discharge an electron, resulting in a cation. H(g)→H+(g)+e− This energy is usually expressed in kJ/mol, or the amount of energy it takes for all the atoms in a mole to lose one electron each.

Answer 2

Ionization of energy is the amount of energy required to remove electron from valence shell of isolated gaseous atom.