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Chemistry

NEET ChemistryClass 11Stability of half-filled and fully filled orbitalsMediumAssertion–Reason

Question 7 of 10

Chromium breaks the simple aufbau filling order in its ground state. Judge the Assertion (A) and the Reason (R) below.

  • Assertion (A): The ground-state configuration of chromium (Z = 24) is [Ar]3d⁵4s¹ rather than [Ar]3d⁴4s².
  • Reason (R): Exactly half-filled subshells are extra stable because of their symmetrical distribution and larger exchange energy.

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