Ionization energy of an element is :

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equal in magnitude but opposite in sign to the electron gain enthalpy of the anion of the element

energy required to remove one valence electron, from an isolated gaseous atom in its ground state

equal in magnitude but opposite in sign to the electron gain enthalpy of the cation of the element

same as electron affinity of the element

answer is A, C.

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Detailed Solution

The amount of power needed to remove the outermost electron from an element's atom.
The amount of energy required to remove an electron from a neutral atom is known as the ionization energy or ionization potential.

It is also equivalent to the electron gain enthalpy of the element's cation in magnitude but opposite in sign.

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