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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Amol ashok pawar
As we talk about ionisation energy, the energy required to remove an electron from one single atom is to be counted. This is feasible in gaseous state. Of course not limited to gaseous state as it can be done in liquid and solid state but again it will give different values. Just like the solubility of compound is measured at standard 25 °C It can be calculated at different temperatures but will give different values so for standard practice ionization is calculated at gaseous state.