In order to remove one electron from a 3S orbital of gaseous sodium atom, about 496KJMol-1 of energy is required. This energy is referred to as
electron affinity
ionization energy
activation evergy
electronegativity
Explanation
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From the question energy required to REMOVE one electron then dats ionization energy as it deals with the loss of electron, electron affinity is the opposite of ionization energy, electron negativity ability to attracts electrons & activation energy is the minimal energy required for a reaction to occur
ionization energy is d minimum energy required by an electron to move out of it's orbit.
Here is an explanation:
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. 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.
The ionization energy, or ionization potential, is the energy required to completely remove an electron from a gaseous atom or ion. The closer and more tightly bound an electron is to the nucleus, the more difficult it will be to remove, and the higher its ionization energy will be.
