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JEE MainChemistryClassification of Elements and Periodicity in Properties

Given below are the elements: (A) Mg (B) Al (C) Si (D) P (E) S Choose the correct increasing order of their first ionization enthalpy from the options given below:

Options

  1. A(B) < (A) < (C) < (E) < (D)
  2. B(A) < (B) < (C) < (D) < (E)
  3. C(A) < (B) < (C) < (E) < (D)
  4. D(B) < (A) < (C) < (D) < (E)

Correct answer

A. (B) < (A) < (C) < (E) < (D)

Step-by-step solution

The first ionization enthalpy generally increases across a period from left to right due to an increase in effective nuclear charge. However, exceptions occur due to extra stability of fully filled and half-filled subshells: 1. Group 2 elements have fully filled s -orbitals, making their ionization enthalpy higher than that of Group 13 elements. For Period 3: Mg ( 3s^2 ) > Al ( 3s^2 3p^1 ). 2. Group 15 elements have half-filled p -orbitals, making their ionization enthalpy higher than that of Group 16 elements. For

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