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Atomic Structure and Electron Configuration

AP Chemistry· difficulty 4/5

How many electrons in a neutral chromium atom (Z=24) have the quantum number ℓ=2\ell = 2?

  • A

    5

    check_circle
  • B

    10

  • C

    0

  • D

    6

Explanation

ℓ=2\ell = 2 corresponds to dd orbitals. Cr's anomalous configuration is [Ar] 3d5 4s1[Ar]\,3d^5\,4s^1, so 5 electrons have ℓ=2\ell = 2.

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