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What is screening effect? How does it influence the ionization enthalpy? |
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Answer» Screening Effect: The electrons of inner shells (i.e. core electrons) screen the outermost electrons from the attractive pull of the nucleus. Such type of effect is called screening effect. As the screening effect increases, the effective nuclear charge decreases. Consequently, the force of attraction by the nucleus for the valence shell electrons decreases and therefore the ionization enthalpy decreases. |
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