Barium (Z = 56) has two electrons in the p-shell (valance shell). What are the maximum number of electrons in the penultimate shell i.e O-shell?
Answer: 18
Explanation
Barium (Z = 56) → Electron configuration:
[Xe]6s²
Barium's electron distribution:
- K = 2
- L = 8
- M = 18
- N = 18 ⬅ Penultimate shell (4th shell / N-shell)
- O = 8 (valence shell)
The penultimate shell (N-shell) holds 18 electrons in Barium.
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