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Which element in the periodic table has the largest ionization energy and which has the smallest?

April 26, 2017element energy ionization largest periodic table smallest

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Which element in the periodic table has the largest ionization energy and which has the smallest?

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On average, moving along the periodic table left to right, ionization energy increases, while moving top to bottom it decreases. The element with the highest ionization energy, therefore, appears on the top-right: helium, at 2372.3 kJ mol.