What is ionisation enthalpy?
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the energy needed to remove the outermost orbit's electron is called ionisation enthalpy . ionisation because removing or adding electron in an atom make that atom an ion . it maybe an anion or cation
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- ionization enthalpy of an element is defined as the amount of energy required to remove "the most loosely" electron from the outermostmost shell of it's isolated gaseous atom in the ground statelogens(Cl,F,Br etc.) and least for metals especially alkali metals (lithium,sodium,potassium etc..)
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