When the difference between successive Ionization Energies of a given element is exceptionally large, its electron configuration shows that the last electron is ejected from a noble gas configuration. For example, IE₂ of K has a high, and the electron is ejected from a noble gas configuration.
What is Ionization Energy?
- Ionization energy (IE) is the least amount of energy needed to free the most loosely bound electron from an isolated gaseous atom, positive ion, or molecule in physics and chemistry.
- For neutral atoms, the ionization energy is positive, indicating that it is an endothermic process. The ionization energy of an atom is roughly proportional to the distance between its outermost electrons and its nucleus.
- Ionization energy is often measured in electron volts (eV) or joules in physics (J). The energy required to ionize a mole of atoms or molecules is how it is stated in chemistry.
- Within a certain period, ionization energy typically increases from left to right.
- In a particular group, ionization energy typically decreases from top to bottom.
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