What do you mean by Ionization Potential? It depends on which factors? - QS Study
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The amount of energy required to remove the most loosely held electron from a neutral gaseous atom of an element in its ground state to form positive ion is called ionization potential of that element.

It is dependent upon several factors:

(i) Atomic size

(ii) Increase of positive charge at nucleus

(iii) Principal quantum number

(iv) Atomic number / electronic configuration

(v) Shielding effect.