Question

Define ionization energy explain the factors depends on ie

Answer 1

it is the energy required to remove the electron from the outermost shell of an atom

Answer 2

ionization energy or ionization enthalpy is the energy required to remove an electron from the outermost shell or the valence electron .
factors depending on it :
1) It depends on the atomic radius
2)it depends on effective nuclear charge
3)it depends on the shielding effect
4)it depends on the half filled or full filled orbitals.