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JEE Main202429 Jan 2024Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The element having the highest first ionization enthalpy is

Options

  1. ASi
  2. BAl
  3. CN
  4. DC

Correct answer

C. N

Step-by-step solution

The first ionisation energy is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the gas phase. The ionisation energy decreases from top to bottom in groups, and increases from left to right across a period. Nitrogen and carbon belong to second period elements, hence they have more ionisation energy than the other two elements. It is highest for nitrogen because nitrogen is a more stable half-filled electronic configuration. Al < Si < C < N ; IE 1 order. Hence option C is

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