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Prove that ionization energy is a periodic property. |
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Answer» SOLUTION :Variation in a PERIOD: On moving across a period from left to right, the ionization enthalpy VALUE increases. This is due to the FOLLOWING reasons: • Increase of nuclear charge in a period • Decrease of atomic size in a period Because of these reasons, the valence electrons are held more tightly by the nucleus, thus ionization enthalpy increases. Hence, ionization energy is a periodic property. Variation in a group: As we move from top to bottom along a group, the ionization enthalpy decreases. This is due to the following reasons: • A gradual increase in atomic size • Increase of SCREENING effect on the outermost electrons due to the increase of number of inner electrons. Hence, ionization enthalpy is a periodic property. |
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