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AP EAMCET20227 Jul 2022Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Identify the element which has highest second ionisation enthalpy.

Options

  1. ACarbon
  2. BPhosphorus
  3. CNitrogen
  4. DOxygen

Correct answer

D. Oxygen

Step-by-step solution

As we move across a period, effective nuclear charge (Z_ eff ) increases and so do the ionisation energy and moving down a group, effective nuclear charge (Z_ eff ) decreases and so do the ionisation energy. So, phosphorus belonging to 3 rd period will have less ionisation energy than 2nd period elements. Considering the first ionisation energy of 2nd period elements, N is greater than O as N has half-filled stable electronic configuration, but after the removal of 1 electron, oxygen acquires a half-filled stable e

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