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NEET2010ChemistryStructure of AtomActual

Which of the following configurations corresponds to element of highest ionisation energy?

Options

  1. A1 s^2, 2 s^1
  2. B1 s^2, 2 s^2, 2 p^3
  3. C1 s^2, 2 s^2, 2 p^2
  4. D1 s^2, 2 s^2, 2 p^6, 3 s^1

Correct answer

B. 1 s^2, 2 s^2, 2 p^3

Step-by-step solution

The ionisation energy of 1 s^2, 2 s^2, 2 p^3 configuration is highest due to the presence of half-filled (stable) orbitals.

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