Electron shell summary
K/L/M… occupancy from atomic number.
Calculator
How to use
Shells
Bohr-style occupancy summary, not full quantum assignment.
Educational use only. Double-check values for labs, homework, and exams.
K/L/M… occupancy from atomic number.
Bohr-style occupancy summary, not full quantum assignment.
Educational use only. Double-check values for labs, homework, and exams.
Model / formula
Ground-state configuration breakdown (Z = 1–118)
Result
Full configuration: [Ar] 3d6 4s2 Noble-gas core: [Ar] Outer subshells: 3d6, 4s2 Principal quantum shell populations need full Aufbau expansion — use configs above as the teaching standard.