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AP EAMCET2001ChemistryClassification of Elements and Periodicity in Properties

The electronic configuration of elements A, B and C are [ He ] 2 s^1,[ Ne ] 3 s^1 and [Ar] 4 s^1 respectively, which one of the following order is correct for the first ionization potentials (in kJ mol ⁻¹ ) of A, B and C ?

Options

  1. AA>B>C
  2. BC>B>A
  3. CB>C>A
  4. DC>A>B

Correct answer

A. A>B>C

Step-by-step solution

Ionisation potential of A, B and C elements decreases with the ease of removal of electron from A to C . Atomic size increase from A to C , hence ionisation potential decrease in the same order. So, order of ionisation potential is A>B>C

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