Question

The number of electrons with magnetic quantum number $m = 0$ in the elements with atomic numbers $Z = 24$ and $Z = 29$ are respectively

• A. 12, 13
• B. 12, 12
• C. 13, 12
• D. 14, 15

Hint:

For elements with partially filled d-orbitals, count the number of electrons in the relevant orbitals to determine the value of $m$.

Answer 1

The Correct Option is A

The number of electrons with a particular magnetic quantum number $m = 0$ can be found from the electron configuration. For $Z = 24$ (Chromium) and $Z = 29$ (Copper), the number of electrons with $m = 0$ corresponds to the number of orbitals in the $d$-subshell. For both elements, these are 12 and 13 respectively.