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The 29 pages that link to Electron shell, each with the reason it gives.

• Electron configurationBroader topic: Shells organize the broad energy levels in an atomic configuration.

• Valence electronRelated: The outermost occupied shell defines which electrons are valence electrons.

• Pauli exclusion principleBroader topic: Exclusion limits how many electrons can occupy each shell's available states.

• PotassiumRelated: Potassium’s outermost electron shell helps account for its reactivity.

• CalciumRelated: Calcium’s outer electron shell helps explain its tendency to form 2+ ions.

• Alkali metalRelated: Moving down Group 1 adds an occupied shell while preserving one outer electron.

• Noble gasRelated: The outer shell’s occupancy distinguishes noble gases from neighboring elements.

• HeliumRelated: Helium’s two electrons fill its only shell, giving the atom a stable configuration.

• X-ray fluorescenceBroader topic: Vacancies in inner shells set the energies of the emitted characteristic X-rays.

• Octet ruleNarrower topic: The rule is framed in terms of filling an atom’s outer electron shell.

• Potassium ionRelated: Potassium loses its single outer-shell electron to form K⁺.

• Sodium ionRelated: After losing one electron, sodium has a filled outer shell.

• Principal quantum numberRelated: Shells are the energy-level groupings that n labels.

• Energy-dispersive X-ray spectroscopyRelated: EDS peaks arise when electrons fill vacancies in particular shells.

• Valence shellNarrower topic: The valence shell is the outermost occupied member of an atom’s electron shells.

• Auger effectRelated: The effect is named by the shells from which its electrons move.

• Main-group elementRelated: Shell structure helped explain recurring properties across main-group periods.

• Period 3 elementRelated: Each Period 3 atom has electrons in a third principal shell.

• Helium atomNarrower topic: Both helium electrons occupy the first shell in its ground state.

• Period 2 elementRelated: The second shell fills across Period 2.

• Period 4 elementNarrower topic: The fourth-period label corresponds to filling the fourth principal electron shell.

• Period 6 elementRelated: The sixth shell is filled across this period, with subshell-filling exceptions.

• Period 7 elementRelated: Period 7 elements have electrons occupying the seventh principal shell.

• UnpentquadiumRelated: Predictions for element 154 depend on how its electrons fill high-numbered shells.

• UntrienniumRelated: Predicted electron-shell structure would shape the chemistry of any element 139 atoms.

• UntriniliumRelated: Its predicted chemistry depends on how electrons occupy shells and subshells.

• Period 1 elementRelated: Period 1 corresponds to atoms filling the first electron shell.

• UntriquadiumRelated: Predictions for element 134 depend on how its electrons occupy high-energy shells.

• UntriseptiumRelated: Its predicted chemistry depends on how electrons occupy shells at extreme nuclear charge.