what is ionization energy? the distance between the nucleus and the edge of the atom. the energy needed to…

what is ionization energy? the distance between the nucleus and the edge of the atom. the energy needed to remove an electron. the ability to attract an electron. how easily an atom accepts an electron.
Answer
Brief Explanations:
Ionization energy is defined as the energy needed to remove an electron from a gaseous atom or ion.
Answer:
The energy needed to remove an electron.