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ChemistryJEE Main 23 Jan 2026, Shift 1·Q3·MCQ·Easy

Classification & Periodicity · Ionization enthalpy trend

The correct trend in the first ionization enthalpies of the elements in the 3rd^\text{rd} period of periodic table is:
  1. (1)Al << Si << S << P << Cl
  2. (2)Al << S << P << Si << Cl
  3. (3)Si << S << Al << P << Cl
  4. (4)S << Si << Al << P << Cl

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See the full 23 Jan 2026, Shift 1 paper