If the ionization energy is high, that means it takes a lot of energy to remove the outermost electron. The first ionization energy for helium is slightly less than twice the ionization energy for hydrogen. Ionization energy values are typically very high and follow trends throughout the periodic table. The ionization energy or ionization potential is the energy necessary to remove an electron from the neutral atom. Ionization energy is the energy required to remove an electron from an atom or ion in the gas state. As stated in earlier reading, 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. The ionization energy of an atom is equal to the amount of energy given off when an electron is added to an atom. When an electron is added to an atom, we call the energy given off the electron affinity.
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