Question

What is the unit of ionization energy?
1. volt
2. KJ mol^-1
3. joule
4. Nm

Answer 1

Correct Answer - Option 2 : KJ mol^-1

The correct answer is KJ mol-1

• Ionization energy is the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule.
• It is quantitatively expressed as X(g) + energy ⟶ X+(g) + e− where X is any atom or molecule, X+ is the ion with one electron removed, and e− is the removed electron.
• The adiabatic ionization energy of a molecule is the minimum amount of energy required to remove an electron from a neutral molecule.

• Ionization energy generally increases from left to right within a given period (that is, row).
• Ionization energy generally decreases from top to bottom in a given group (that is, column).
• The work function is the minimum amount of energy required to remove an electron from a solid surface.