What si 1st ionisation energe and 2nd ionisation energy
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The first ionization energy is the energy it takes to remove an electron from a neutral atom. The second ionization energy is the energy it takes to remove an electron from a 1+ ion.
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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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