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NEET2019ChemistryStructure of AtomActual

Assertion : The free gaseous Cr atom has six unpaired electrons. Reason : Half-filled s -orbital has greater stability.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

The 3 d -subshell in case of Cr gets exactly half-filled with configuration 3 d^5 4 s^1 which imparts stability to the atom.

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