Shell
| Formula / Notation | n=1,2,3,...; shell capacity: 2n² electrons |
|---|---|
| Also Known As | Electron shell, principal energy level, principal quantum shell |
What is Shell?
An electron energy level or principal quantum shell, denoted by the principal quantum number n. Each shell contains one or more subshells (s, p, d, f). The first shell (n=1) holds up to 2 electrons; the second (n=2) holds up to 8; the third (n=3) holds up to 18.
Formula & Notation
Other Names / Synonyms: Electron shell, principal energy level, principal quantum shell
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
An electron energy level or principal quantum shell, denoted by the principal quantum number n. Each shell contains one or more subshells (s, p, d, f). The first shell (n=1) holds up to 2 electrons; the second (n=2) holds up to 8; the third (n=3) holds up to 18.
The shell model of electron configuration is used to explain the periodic properties of elements and their chemical behaviour. Shell filling order underpins the aufbau principle used to write electron configurations. Understanding shells is foundational for predicting bonding and reactivity.
Shell is a theoretical model with no direct safety implications. Understanding electron shells helps predict the reactivity of elements, particularly those with partially filled outer shells.
The formula or notation for Shell is: n=1,2,3,...; shell capacity: 2n² electrons