1.

(a) Define ionization energy. (b) Prove that ionization energy is a periodic property.

Answer» <html><body><p></p>Solution :(a) The energy required to remove the most loosely held electron from an isolated gaseous atom is called as ionization energy. <br/> (b) Variation in a <a href="https://interviewquestions.tuteehub.com/tag/period-1151023" style="font-weight:bold;" target="_blank" title="Click to know more about PERIOD">PERIOD</a>: <br/>On moving across a period from left to right, the ionization enthalpy value increases. This is due to the following <a href="https://interviewquestions.tuteehub.com/tag/reasons-1179183" style="font-weight:bold;" target="_blank" title="Click to know more about REASONS">REASONS</a>: <br/>• Increase of <a href="https://interviewquestions.tuteehub.com/tag/nuclear-2474" style="font-weight:bold;" target="_blank" title="Click to know more about NUCLEAR">NUCLEAR</a> charge in a period<br/>• Decrease of atomic size in a period<br/>Because of these reasons, the valence <a href="https://interviewquestions.tuteehub.com/tag/electrons-969138" style="font-weight:bold;" target="_blank" title="Click to know more about ELECTRONS">ELECTRONS</a> are held more tightly by the nucleus, thus ionization enthalpy increases. <br/>Hence, ionization energy is a periodic property. <br/>(ii) Variation in a group: <br/>As we move from top to bottom along a group, the ionization enthalpy decreases. This is due to the following reasons: <br/>• A gradual increase in atomic size<br/>• Increase of screening effect on the outermost electrons due to the increase of <a href="https://interviewquestions.tuteehub.com/tag/number-582134" style="font-weight:bold;" target="_blank" title="Click to know more about NUMBER">NUMBER</a> of inner electrons. <br/>Hence, ionization enthalpy is a periodic property.</body></html>


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