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Explain the periodic trend of ionization potential. ins. |
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Answer» Solution :(a) The energy required to remove the most LOOSELY held electron from an ISOLATED gaseous ATOM is called as ionization energy. (B) Variation in a period. Ionization energy is a periodic property. 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. Therefore, ionization enthalpy increases. (c) 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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