Engineering
Chemistry
Electronic Configuration
Question

For 24Cr which of the following statements is/are correct.

Number of minimum or maximum electrons with same spin quantum number  are '9' or 15 respectively.

Number of electrons with azimuthal quantum number '1' are 12

Number of electrons with principle quantum number '3' are 13

Number of electrons with magnetic quantum number '0' are 12

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Solution

Chromium (Cr, Z=24) has electron configuration: 1s22s22p63s23p64s13d5 (anomalous due to half-filled stability).

Analyzing n=3 electrons: 3s² (2e), 3p⁶ (6e), 3d⁵ (5e) = 13 electrons. This matches the first statement.

Final Answer: The statement "Number of electrons with principle quantum number '3' are 13" is correct.