Total number of electrons in Cu for which the summation of azimuthal quantum number and magnetic quantum number is zero is :
Correct answer: B. 11 or 12
- A. 7 or 8
- B. 11 or 12
- C. 5 or 6
- D. 10 or 11
Explanation
The total number of electrons in copper (Cu), which has an atomic number of 29, is 29. The electron configuration is [Ar] 3d10 4s1. The azimuthal quantum number (l) for the d subshell is 2, and the magnetic quantum number (ml) can take values ranging from -l to +l. The combination of these quantum numbers must sum to zero. The correct answer is 11 or 12, as they correspond to valid electron configurations where the sum of the azimuthal and magnetic quantum numbers can equal zero. Other options do not satisfy this requirement, as they fail to provide valid sums of zero.
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