Beryllium Electron Configuration

Interactive reference for beryllium's electron configuration (1s² 2s²), orbital diagram, and key atomic properties.

Z = 4 Be Beryllium

Beryllium — Electron Configuration

Atomic number 4 · Alkaline earth metal · Period 2, Group 2 · s-block

1s² 2s² [He] 2s² 4 electrons 2 valence e⁻

Subshell Breakdown

Subshell Type Electrons Max Capacity Notation
1s s orbital, shell n=1 2 2 1s²
2s s orbital, shell n=2 2 2 2s²
Total 4

Full Configuration

1s² 2s²

All subshells written explicitly.

Noble-Gas Shorthand

[He] 2s²

[He] = 1s² (the filled helium core).

Shell Fill Summary

Shell 1 (n=1) — 1s² 2 / 2 electrons (100%)
Shell 2 (n=2) — 2s² only 2 / 8 electrons (25%)

Shell 2 can hold up to 8 electrons (2s + 2p). Beryllium uses only 2 of those 8 slots.

Summary

Interactive reference for beryllium's electron configuration (1s² 2s²), orbital diagram, and key atomic properties.

How it works

  1. The Aufbau principle fills orbitals from lowest to highest energy.
  2. Beryllium's 4 electrons occupy two subshells: 1s (2 electrons) and 2s (2 electrons).
  3. The orbital box diagram shows each electron as an arrow following the Pauli exclusion principle.
  4. Noble-gas notation replaces the inner filled shells with the nearest noble gas in brackets: [He] 2s².
  5. The interactive tabs let you explore the configuration, orbital diagram, and element data separately.

Use cases

  • Quick reference for chemistry homework or exam review.
  • Visualize orbital filling order and the Aufbau principle.
  • Compare beryllium to other alkaline earth metals.
  • Understand why beryllium forms a +2 ion by losing both 2s electrons.
  • Learn noble-gas shorthand notation with a clear example.
  • Teaching aid for introductory atomic structure lessons.

Frequently Asked Questions

Last updated: 2026-06-18 · Reviewed by Nham Vu