Ionization energy
MINIMUM AMOUNT OF ENERGY REQUIRED TO REMOVE AN ELECTRON FROM AN ATOM OR MOLECULE IN THE GASEOUS STATE
First ionization energy; Ionisation energy; Ionisation enthalpy; Ionization enthalpy; Electron binding energy; Ionization Potential; Second ionization energy; Ionisation potential; Ionization potential; Ionisation energies; Ionization Energy; Ionization energies
In physics and chemistry, ionization energy (IE) (American English spelling), ionisation energy (British English spelling) is the minimum energy required to remove the most loosely bound electron of an isolated gaseous atom, positive ion, or molecule. The first ionization energy is quantitatively expressed as