short definition of ionisation potential
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The ionization energy or ionization potential is the energy necessary to remove an electron from the neutral atom. It is a minimum for the alkali metals which have a single electron outside a closed shell. It generally increases across a row on the periodic maximum for the noble gases which have closed shells.
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Answer: The amount of energy that must be supplied to gaseous atom/molecule to remove a valence electrons from it.This energy input is called ionization potential of the atom.
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