The number of electrons with magnetic quantum number in a ground-state chromium atom () is
Answer and explanation
Correct answer: D. 12
- Each -orbital () has only : has , has , has , and has electron.
- Each -subshell () contains one orbital with : has and has electrons.
- The -subshell () has five singly occupied orbitals with , contributing electron with .
- Each -subshell () contains one orbital with : has and has electrons.
- The -subshell () has five singly occupied orbitals with , contributing electron with .
- Step 1: Write the ground-state electron configuration of chromium (): , which exhibits anomalous half-filled -subshell stability.
- Step 2: Count the electrons occupying orbitals with magnetic quantum number :
- Step 3: Sum the counts across all subshells: .
Answer
12.
Practise more Atomic structure.
Free questions with an explanation for every one, and full timed WBJEE mock tests.