4
Be
Beryllium
Beryllium
Beryllium (Be)
Alkaline Earth Metals · Solid · Period 2 · Group 2
Element Properties
- Atomic Number
- 4
- Symbol
- Be
- Atomic Mass
- 9.0122
- Category
- Alkaline Earth Metals
- Standard State
- Solid
- Period
- 2
- Group
- 2
- Electronegativity
- 1.57
- Atomic Radius
- 153
- Ionization Energy
- 9.32
- Electron Affinity
- —
- Oxidation States
- +2
- Melting Point
- 1560 K (1286.85 °C)
- Boiling Point
- 2744 K (2470.85 °C)
- Density
- 1.85
- Electron Configuration
- [He]2s2
- Year Discovered
- 1798
Electron shells
[He]2s2
Electrons are arranged in shells (principal energy levels) around the nucleus. The diagram is a schematic — orbitals in the same shell are not drawn separately.
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Frequently asked questions
What is the atomic number of Beryllium?
The atomic number of Beryllium is 4, which equals the number of protons in its nucleus.
What is the atomic mass of Beryllium?
The atomic mass of Beryllium is approximately 9.0122 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Beryllium?
The electron configuration of Beryllium is [He]2s2.
Where is Beryllium in the periodic table?
Beryllium is located in period 2, group 2.
When was Beryllium discovered?
Beryllium was discovered in 1798.
Related elements
Same group
12
Mg
Magnesium
24.305
20
Ca
Calcium
40.08
38
Sr
Strontium
87.62
56
Ba
Barium
137.33
88
Ra
Radium
226.025