Question

The minimum energy required to remove an electron from the outer most orbit of an atom is called:

• A. bond energy
• B. electron affinity
• C. ionization energy
• D. binding energy

Answer 1

The correct option is C ionization energy

Ionization energy is the quantity of energy that an isolated, gaseous atom in the ground electronic state must absorb to discharge an electron, resulting in a cation.

$H\left(g\right)\to H^{+}\left(g\right)+e^{-}$ .....(1)

This energy is usually expressed in kJ/mol, or the amount of energy it takes for all the atoms in a mole to lose one electron each.

Hence, the correct option is $\text{C}$